Search Results: hanging up on a girlfriend

Have you ever got into a situation that you think your boyfriend is the problem, but in reality, you're the problem?
That's me right now. Let's called my boyfriend A, and the girl he has feeling for B.
I've been with A for a year (we started dating in January) and in September, I started to notice he talked to this specific girl and I warned him that she had feeling for him but he didn't listen to me. I was uncomfortable about it so i started to give him attitude and we started to fight over petty stuff.
When we finally talked about our problem, he told me that he talked to his friend (B) more than talking to me because I gave him attitude, and he started to treat B as if she was his girlfriend (hanging out with her, going to concert, bring her to dance practice,...). When I confronted him about his feeling for B, he told me that he only liked her as a friend but when he posted her photo on his Instagram stories (twice), he always hid me and told me that he knew i would be jealous even though i told him i was cool about it. Plus, he didn't celebrate my birthday (or get me a gift) with me but he celebrated her birthday instead. He put a bunch of heart emoji in her contact, and they never stopped talking (Every single day). B has two Instagram account, one that she posted her personal but the other account, she posted a bunch of photos of her and A. She puts caption like "He's cute", "me and a routine: wake up, play game for 5 hours.", "get a man like him". It was really hurt for me to see those photos but why would he tell me that he didn't have feeling for her but she would post photos as if they're dating? Furthermore, he blamed that this relationship is doomed because of me, and he didn't change or anything. My friends said that i'm really feeble-minded to stay with him but I felt like it's all my fault in this relationship.
P/s: I'm 17 by the way, i accidentally put the wrong age on my profile.

Due to social situations and mutual friends we have to socialise at group events quite regularly he has a girlfriend and yesterday at a friends birthday he suddenly kissed me and pushed me into a unisex toilet and pulled down his pants, obviously I pushed him off but he just won’t leave me alone.

Every time we end up socialising for a friends birthday etc he just follows me around, I don’t want to stop hanging out with my friends. I also want to tell the girlfriend but he is incredibly manipulative and I feel she will assume I’m trying to break them up but that would be the worst thing to happen because I know his full attention will be on me again and I don’t want him near me and do not see him as someone i would ever want anything to do with again.

I will be informing her but I want to give him a chance to own up for what he has done because I feel it is far better than coming from me, i’d rather someone who knows her better tells her. I’m also slightly scared because he obviously has no morals and I don’t know how far he will go. Desperately need a bit of advice please.

I met this guy back in August and we instantly hit it off. We would talk whenever we saw each other on campus, but he had a girlfriend so we didn't get close. They broke up after 3 years, and we started talking more whenever we would see each other. One night we ended up spending like 30-45 minutes having a heart to heart. Afterwards we were still just hanging out and messing around. He started playfully poking me, and I just did it right back. We laughed and just spent some time together. He told me that he thought I was pretty amazing, and we locked eyes for like a minute. We always give each other a smile and say hey or whatever when we see each other, and he's definently cute. On Instagram, it's usually just my post and stuff that he likes. We have a bunch of mutual friends and except everyone's Christmas post, he hasn't liked any of the other girls anything. I kinda thought maybe we were possibly going somewhere, but he hasn't made a move or anything. Then today he commented on a Facebook picture of one of our mutual friends and told her she was killing it. I feel like she isn't the most confident person, and I know he likes to encourage people. She's not exactly gorgeous, (although neither am I) and he easily could've just been trying to give her a confidence boost. He also didn't reply to a message I sent, although the only thing he could've replied was you're welcome... I'm not sure I would've replied either, and I know he's busy this weekend. Still though, it made me completely rethink things. Did I missread stuff and make something out of nothing orrr? What would you advise? I also know that his breakup crushed him, so even though it's been a couple months when you have a relationship that long, he might just not have been ready to make another big move.