My boyfriend did something wrong. How can we move past this?

My boyfriend and I are at that point in a relationship where you have that one big thing that kinda makes you question your relationship. But we're working it out. We've been together 8 months and this is the only month we've had that was shaky. We had a discussion where he actually brought his laptop and had copied the text from my fb wall to use as reference. The convo was with my guy friend who he accused of flirting. He thinks that he is second and I am cheating. I admit I did have some things that (he brought to my attention) looked like I was cheating. Like meeting him a few feet from my house (parking), not answering the phone late (I live with my nosey parents), and not re-introducing my boyfriend to my parents. At first he wanted to break up, but by the end of our convo he told me he loves and trusts me and doesn't want to break up. We agreed to work it out. But he made it sound like we aren't together but we are not free to sleep with other people, etc. So in my mind that's the same as being together.

Immediately I'm trying to make changes that he asked me for and etc. I admit I was wrong at times but so was he. He stalks my fb. I said I was sick and he sent me a text saying "hey I know you're sick. Is there anything I can do for you?" That confirmed to me that we're on the right track. Since our talk, we met and worked out and I bought him his fav food that I remembered because I thought he might be hungry, we sat in the car and talked til the park closed and when he left (he kissed me on his own lol) and we got along fine, etc. To me you don't kiss people you don't want to be with anymore.

Heres where the problem begins: Last week was his birthday and I just got a contract with a TV company and I'm 19 and he's 20. I've been working 10-14hr days which is a big thing for me. He didn't wish me luck or say anything to me. As soon as I got off work really late at night and waited even though I was tired til almost twelve to call and wish him a happy birthday, I texted him telling him I have something planned (I bought him a signed Kobe basketball he doesn't know yet), and I said "happy birthday babe" on his fb wall. He deleted me off his Facebook along with the comment. He was up that night and didn't say thank you to me like he did to everyone else on Facebook. He hasn't responded to my text or call and he's on spring break and is still thanking everyone. He sends me a text two days later "Thank you for wishing me a happy birthday" and I didn't respond. Today (4 days later) I text him asking "Are you busy this week" but I really want to give him a piece of my mind. The reason why I did all of that is because he always gets mad when I don't call or text him often. I think this relationship is over...but I pray that its not. Part of me wants to end it and another part wants us to move forward and get stronger as a couple. I feel like he just randomly flipped. Also an ex girlfriend of his that cheated on him wished him a happy birthday and he didn't delete her.

My boyfriend did something wrong. How can we move past this?
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