Advice

So ive been seeing a girl for about 5 months now and I wanted to get some relationship advice on how to move forward. So the first real problem we had was about 2 months into our relationship. It was because she had gone out to eat with a friend of hers and towards the end he pulls out some roses and chocolate from the back of his car to give to her. So I got mad about this and was asking why her friend was giving her flowers and chocolate as it is usually used romantically. She explained that there was nothing to worry about. She said that although they had had a thing in the past that she had moved on from that and that even before i was in the picture they were only friends and didn’t view him like that anymore. At first I thought this was preposterous. I was supposed to believe that although they had had a thing in the past that now they were just friends even with him giving flowers to her. Although I was upset about it I decided to move on from it and trust her. So although i said we have been dating for 5 months it only became official about 1.5month ago when i formally asked her. But before we would already do bf and gf things and had said that we would see nobody else. So about a month and a half ago when i asked her out she posts me on her social medias for the first time. He sees this and the day after texts her saying that they cannot be friends anymore since she now has a bf. Then about a day or two later she tells me that he indeed says he cannot continue to be friends w her to take care of his mental health but wants to give her a birthday present as a parting gift. Her birthday was only about a week after i asked her out. She asked me if she should decline him or take the gift. To which i told her to do as she wanted bc i didnt want to be in a relationship were i had to tell her what to do. So in my mind ik that the possibility of her receiving the gift is possible. But first of all I didnt like how she was still texting this guy after the flower thing happened. I tried to tell her how she was seeing me and that although she thought he was her friend that it didnt really make sense anymore since he clearly liked her. So her birthday came around and at first I wanted to be the first one to say happy birthday so i was looking at the clock until it said 12:00am sharp to call her along with a long message i had already sent through messages. I had already been messaging her leading up to this and her responses had stopped at about 11:47 when she snapped me a picture of her walking outside. So when i called her at 12:00am sharp she didn’t answer. So i called her again and messaged her on why was she not picking up? She responded and just said to wait and that she would in a second. So at around 12:20 she calls me back and I had a gut feeling that she didn’t pick up bc she was with the guy getting her present. So now we go back to when i told her she could do whatever she wanted about receiving the gift or not. I just didn’t think it would be like this, 12:00am, the day of her birthday and with me calling and her not picking up. So this all happened at 12:00am and i was pretty upset about it. I felt like an idiot staying up trying to say happy birthday while she was getting his present in his car. I however sucked it up and went on to spend her birthday with her as we had planned. She explained and showed me evidence that nothing had happened between them. Although what did catch my attention was when she showed me the messages and he said “i forgot to give you your toothbrush ill just throw it away now”. This struck me because she had been downplaying their relationship or the “thing” they had and told me that it was only ever one date that they ever went on. So in my head I never imagined that they had had sex. She corrected herself and said that it was only ever one real date going to a restaurant. She said that she only mentioned one date because all the other times it was just fast food takeout and watching shows together. This honestly infuriated me because it even made it more preposterous to me how she thought or expected me to think that they were just friends. I was upset about it but decided to squashed it for the day because i was not about to ruin her birthday. But i honestly felt like i was being laughed in the face. Even though there were text messages and whatnot that proved they hadn’t had anything romantic or sexual after i showed up it made me so mad how she was friends with him while being with me and told me he was just a friend. However, since she had shown me that it was all before me i decided to move past it. So now about two days ago she was going through my social medias so i grabbed her phone and did the same. I didnt find anything or anyone but through her memories on Snapchat i saw a picture of the guy that i mentioned and also a nude from him. I checked the time stamp on it and it was indeed before i was a part of her life. However, i asked myself why does she still have it? And i scrolled further down and found more pictures of him, on a regular date but also of basically every guy she has seen. She still had pictures of basically everyone she had seen on her phone. I asked her why and she said that she does delete it afterwards but that some escape her bc she already takes a lot of pictures of herself and that she just never gets to it. However after having seen his nude i asked to see her my eyes only. To which she denied. I once again decided to believe her and considering that all the pictures time stamp were a time before me i moved on from it. About 4 days ago now she tells me that shes gonna help her friend in a research she is doing. It consists of my gf dressing up nice and then bad and going up to boys and girls hitting on them. The research is supposed to prove whether or people perceive u differently based on how u look or something along those lines. Handed my gf is not in this class and the girl she is helping is a friend of a friend of hers. So she doesnt even need to do it. She did ask me about how i felt about it though and i said the same thing as with the flowers and present i said she could go ahead and go through with whatever she wanted bc i wasnt gonna tell her what to do. So shes going through with it now and it honestly makes me feel uncomfortable. I did tell her that though. I told her that although it did make me uncomfortable that i understood that it was just for school so it wasnt as bad as the other things previous. Obviously i have just stated all the problems in the relationship but there are alot of good things as well especially on her part. But seeing as this is already long enough ill leave it here.