I hate this :(

I think i have relationship OCD. I have been dating my boyfriend for almost 6 months, and i keep doubting his feelings for me....for NO REASON. He has never given me a reason to doubt his feelings, i just do. It drives me nuts, because i KNOW deep down his feelings are true. He's good to me. I mean, like, really good to me. He's never ever been mean to me like all my ex's (they were all abusive), he hasn't lied to me, when he says he's going to do something, he does it (unless something comes up,and he lets me know if he can't do something), he always tells me how much he cares about and loves me, and he always spends money on me and takes me out (to the movies, lunch) when he can. I honestly DON'T know why i am doubting his love or feelings for me. And i know it hurts him....i can see it. When i talk to him about it, hes almost in tears every time. It hurts me.It hurts him, and it puts strain on our relationship. I LOVE him. I know i do. And im NOT going to break up with him. That would tear me apart. I just really hate this doubting that's been going on since our 3 month mark... its not fair.. I don't want to ruin my relationship with him. He's a total sweetheart.. I just wish this would stop. Seriously.