Relationship Toubles

I just woke up and checked my dms after a few days of being offline due to a cold. And I'm talking to my bf and then check his profile and see some chicks name with a <3 next to it. And I'm really suspicious about allat bc he ain't the type of dude to add ppls name like that, not even mine (now that I think about it, would that count as a red flag?)
My friends are all offline, prob sleeping and I really don't know what to do except ask randos on the internet.
We have been together since late February btw

The other party genuinely fell for me but I can’t feel anything but lust for them should I just stay away
Feel like I’m gonna become shitty ml from gaslighting angst manhwas

So relationship troubles man, technically I’m not in one nor have I ever been in one; however, someone did ask me out. So I friend zoned him but I wanna know if that was a good decision because of some reasons
So me being inexperienced I kinda don’t know if I like like someone or just wanna be friends with them, I’ve known him for 2 years and thought maybe I have feelings for him but I wasn’t sure if I just wanted to be friends with him. We weren’t the closest friends until now and I always wanted to have some sort of interaction with him so this year I thought I had to do something considering it was our senior year so I took the chance to kinda force him to be my partner for an assignment allowing me to get his socials and eventually his number
A reason I wasn’t sure about being in a relationship was because although I am outgoing and good with guys I wasn’t sure if I was ready due to some childhood trauma (if you know you know). Also I had a friend who liked dude in the past and was rejected by him, knowing how females are some people don’t like how you go out with a guy they’ve liked in the past so I was wary of that since she is kinda sensitive (although maybe I’m making her be more sensitive in my head than she actually is)
I do like talking to this guy a lot and think about him quite a bit, I do interact with him much differently than my other guy friends I’ve noticed
So I’m wondering if I had made the wrong decision because of the sudden confession or if my decision was fine
also tell me if I’m just making excuses for myself
Sorry for making this needlessly long :/