So here's the thing,

I've been seeing this guy for a few months now, we're only dating each other but aren't on gf/bf terms yet (mutual decision). I really like him a lot a lot, he's sweet and gentle and he makes me happy. He lives an hour or two away from me so we see each other around twice a week. I was also sick for the past week and a half so we were only able to talk through text and stuff.

To put things into perspective, my ex boyfriend and I were together since I was 16 to 19 (2 and a half years) and during that time he'd manipulate me a lot and make me feel like I was overreacting, he kept telling me he can always find someone better etc etc. I finally got out of that relationship and when I was ready to move on, I met the guy I'm currently dating. He's way better than my ex and he seems to really care about me and since I do have a tendency to be a little emotionally closed of, I wanted to try and just let myself feel what I feel without trying to stop it. The other day, however, we were talking about the honeymoon phase and he mentioned that he didn't feel like that, and that he likes me but he didn't go trough the whole honeymoon phase. That would've been fine but then he said that sometimes he feels like his previous relationship ruined relationships to him in general and that he doesn't know if he's capable of actually being in love with someone. That crushed me, because I'm already in too deep to back out now and I feel like letting myself feel what I feel was a mistake. We talked about it the next day and he said that he just felt really depressed that day and that he said all those things without thinking. He said that he couldn't stop thinking about me all day long, that he finds the thought of me leaving is scary to him and that he really doesn't want to stop seeing each other. I told him I can give him time if he wants to think about it and that I don't want to rush into something and regret it. He said he doesn't need time and that he's sure that he wants to be with me. We said we'd talk about it more when we see each other so we ended on that. But now I feel like I'm starting to close off on him, cause I'm scared of wasting years on someone who's not going to appreciate me all over again. He asks what's wrong but I don't know what to tell him. I'm not sure what's wrong and I don't want to be dramatic for no reason when we're going out this week, but something's bothering me and I can't pin point exactly what. What do I say? Thanks for reading, sorry for the grammar, I'm not a native English speaker <3