Am I a cheater?

Past story:

I had a crush on a guy for almost 5 yrs in highschool. I had a deep feelings for him,confessed him too but obviously got friend zoned. Tried my best to get his attention but failed. At last I realised & finally try to give up and move on. It was very hard that it seemed that I'll love him in my entire life but still it was necessary to move on so tried using different dating apps just to get distracted (not for dating).

I used dating apps by using fake account as I was a minor & had a fear of getting cought by someone I know. Still mostly I used it for fun, cracking lame jokes with strangers, sometimes sharing my sad stories and mainly no such intension to find a date!

After few months like this I finally found this guy, I don't know why thT day I was completely myself,not joking around or try to have fun, but just myself. As it was a fake acc that guy asked me to show a picture of myself for a second & i even did that, shared social media details (usually does this) & after this he was the first guy who got my number to whom I meet in a dating app!

Present story:

We eventually started a serious relationship, I found him most carering and selfless person which I needed the most at that time. We were good to each other at every step of life. Fought and healed together in many tough situations. Even survived greatly in LDR! Slowly we found our future together, planning everything for future keeping each other together. Its been 2yrs of our relationship in last August. We even celebrated it in our own way.

Present struggle:

As I've mentioned it earlier about that dating app, I always considered it as a platform to explore people,their interests,nature etc as I love to know human psychological things which are always different to one another. It always exicites me to understand a person. Unfortunately I like to talk to guys more that girls as I am more curious about guys. As I am also a girl and surrounded by girls all my life, i think I knew much about the girl psychology. During our relationship I still sometimes used that app without giving a second thought. & Obviously it bothered my bf and asked me not to use it. I realised and stopped it for almost forever.(this happened at the beginning of our relationship)

But recently while chatting with each other and in a funny manner I tount him that no girl will be impressed by him if he shows up as single. I guess it triggred him and also jokingly challenged me that he'll show that how many girls will come and will show interest him he showed up in a dating app. I accepted the challenge and he did it. It was all fun , he talked to one girl and at last told her about this challenge and the disconnected the chat and leave the app . He showed screenshot about their chats and as he said we won the challenge. It was all good and in fun he suddenly told me u can also try it,go open the app & I said no u don't like it. He said its okay,its just for fun u can do it & i was not interested that time.

One another day also in between talkes I remembered he again told me to try a new dating app casually if I am bored.I said ok if u don't have any problem I'll do it sometime. But never did it at that time.

After few days of that challenge, I was bored at home, didn't got any text from him as he was watching series in his phone,I got a little disappointed and as I was also bored I opened the dating app. Opened a profile,found some guys pics which didn't interest me,some of the right swiped and mostly left swiped,but didn't got a match as I actually didn't used the app but used in chrome browser which had glitches. Then talked to no one and deleted the app. That night when he asked what I was doing I casually told him about it and it fired him up! Had a huge fight about it. I had to mention my intentions towards it. But he didn't listen. I finally realised that after all it's a "dating app" and swore again that I won't open it again.

In my last thread I mentioned about my recent fight with him,there within context he again brag out that dating app thing again. I still considers me as a cheater and asked me again & again why did i opend the app even after explaining him thousand times.

Today I found out that his thoughts were gaslighted by some opinions in qu ora app! I know he mostly search about his problems in this and after asking about his problem with me over the dating app the people in Qu ora made me as a big cheater which I think I can never fix.

PLEASE SOMEONE TELL ME AM I REALLY A CHEATER? IF NOT HOW CAN I CONVINCE HIM ??