I’m not sure if he really loves me

I’m a teen trans boy, I have a boyfriend. I love him a lot and he never fails to make me smile whenever we text. I cant deny it when I say that I do have my doubts about him though. I feel like everyday he’s becoming more and more distant, he’s a sweet guy and he has been since we first started talking. When we first started dating he was always super sweet and kind (that’s what made me realize how much I really did like him), I feel like lately he’s been a bit more distant and he’s simply just become very dry and not very talkative whenever we talk. I always have to be the one to text first if I want us to talk, there’s times when I’m simply not feeling well and I decide to take a break from social media for a couple days, whenever I do that, he never texts me it’s almost as if he just simply really didn’t care. Whenever I text him he answered very shortly and I have to be the one to keep texting if I want the conversation to keep going. I always ask him if we can call of face time, he always says yes but he never goes through with it. No matter how many times that he tells me that he loves me, I just can’t always believe it. I get worried because my friend always tells me that he used to flirt with a lot of people, that makes me worried that he may just be using me and that deep down he really doesn’t love me. He always tells me that he does truly love me but he really fails to show it. He tends to ask me for nudes often and I always deny saying that I’m not ready for that and that it makes me uncomfortable, he’s always very sweet and understandable when I say that but I worry that if I don’t do it soon, he’s just going to get bored and decide to leave me. I love him a lot and I don’t ever want to lose him, but I’m also really sick of feeling shitty pretty much everyday because of him. Today he left me on red with pretty much every message I sent him, I figured that he was just busy since he either way wasn’t really active today, and when he was, it was only for a couple minutes. I worried that I was maybe annoying him and that he would have rather answered his friends instead of me. I’m so sick of feeling so shitty because of him, but like I said, when we do talk, he never fails to make me feel so happy and giggly. I miss the old him so much and I just wish that he would be more talkative and simply just show more love. Im not sure what to do and any advice would be really helpful right now (pls be honest), thank you all very much and I hope that you’re all doing well.