Boyfriend Suddenly Ignores Me, why would he act this way?

Anonymous
I've been dating my boyfriend for over two years and engaged to him for a little over a year now. When we got together, we used to leave little romantic notes for each other. He would bring me flowers home and I would fix him dinner and we'd rent movies and have a movie night. Even when he lost his job and we worked completely different hours, we would still find time for one another. He would drive home on lunch break sometimes and I would wake up (our work hours were opposite) and talk with him. We've been through a rough patch, and we've even taken a break but that only lasted around a week of being apart. We missed each other. We've been back together a little over a month since our break, and he acted fine at first, but now he spends most of his time on WoW or just on the computer talking to friends every day. Whenever he gets home from work, he goes straight to the computer and has no time for me. He has become completely emotionless, and he gets annoyed if I get emotional about it. He says he doesn't want to talk about fixing things, because I just "repeat" myself and we get nowhere...But we get nowhere because he won't come to an agreement. He acts like he loathes being around me anymore. We don't go out to dinner anymore or anything. He doesn't want to leave the house with me. Last night he lied to me and told me he was working late and I got really upset about it but he says he lied because he wanted to see where I went while he was at work because he thinks I'm cheating. He wouldn't talk to me all night and acted like he couldn't sympathize about why I was upset about his dishonesty. He acted like I deserved it since I didn't call and tell him I was leaving the house. This morning, he went to work and we talked on the phone when he had a minute to talk. He said he didn't see a reason we shouldn't just break up, that his feelings were gone. All this after he acted completely fine and in love with me before and just for the past two weeks or so he's been kind of antisocial with me but told me things between us were fine. No warning. He said there was no use in talking about it. He then said he had to get back to work and didn't call or text me the rest of the day until tonight, he texted me that he loved me. I'm so confused. Why would he act this way? I don't know how to react to the heartless way he is suddenly acting. It makes me concerned that there's someone else. He says he wants to talk tonight, but earlier today on the phone he just said he wanted me to move out. We live on property owned by his family with no lease, so there is nothing I can do about him kicking me out. :(
Updates
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He just keeps texting me saying we're going to talk about it when he gets home and that he loves me... :( When we were supposed to be on break, he used to call me at like 2am sometimes to cry and say he missed me. It made our break that much harder on me, especially because it was entirely his idea. He just keeps saying we have things we need to work out alone, but that idea terrifies me since he has created some major trust issues between us over the course of our relationship.
Updates
+1 y
too heavy for my computer, even if I wanted to try it) and it sucks him in for the entire day. He gets irritable when something gets in the way off him playing it. It really hurts that I feel like I have to bargain with him to cut down on his gaming time and spend time with me. I feel like I'm being treated like a chore sometimes. I feel like he'll just go back to gaming all day again eventually. Any ideas? (I had to post this in like three different comments because of the limit...)
Boyfriend Suddenly Ignores Me, why would he act this way?
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