<human>: We've been together for 5 months. I broke up with him about 2 months ago because I found flirtatious texts on his phone to a girl he had recently become friends with. In short, he told her that she was so much more amazing than I was. 

Getting to today, I got back together with him because he really did seem to have changed/wanted to change and be better for me. 

However, on the last date we had before we broke up, he was telling me all about this girl (the one he was flirting with.) I know her favorite movie (Cast Away), that she's a great singer, etc. 

Saturday, he asked me what I thought of Cast Away. I immediately got kind of pissed and told him not to ask me about it. He asked why, and I gave him the cold shoulder. We talked about it and I explained it to him and how it connects to the girl and how it's still a sensitive subject. He told me that he didn't remember it was her favorite movie, and said sorry. 

I know it seems all worked out, but lately he's been getting weird with me again, ever since I got angry about the movie. Usually he texts me all day, sends a good morning text, all the cutesy stuff, but lately, he just ignores me, shoots me a text at night and asks how my day went, and even then he just talks about himself. 

I can't help but be suspicious that he may be talking to someone behind my back again. I feel miserable. I feel like I've made a mistake by getting back together with him. I love him, and he doesn't love me. I care about him deeply, but I just don't get the feeling he cares for me. I feel like a weak person, and I'm not, I'm really not. I don't want to feel like this anymore..but I know how much it hurts to lose him at the same time. 

Am I pathetic? I just don't don't know what to do.

Can you give me a shortened version of the text?
<bot>: boyfriend almost cheated on me once, got back together with him, now he's acting weird again. What do I do?