I don't know what to do about my relationship.?

I'm thinking about breaking up with my boyfriend. But I don't know if I really want to. I've been feeling depressed lately and I'm wondering if this is a self sabotage effort on the part of my subconscious. I think I love him. I'm not certain sometimes, but I think so. We broke up once a couple of months ago because his parents hate me because I don't share their beliefs, long complicated story there, but we got back together the same day. Ever since then, I feel like I've been pulling away from him against my own will. I've been trying to find things wrong with him, reasons to dislike him and be irritated with him. I'm worried that if we end up getting married I'll end up hating him. Sometimes I feel like he's too good for me, too naive and pure and that I'm going to end up ruining him. I don't know where all this pain and doubt is coming from but I want to work through it, I just can't pin point the place where it starts. I also can't afford a visit to a shrink, ha ha. Ergo, Yahoo! Answers. Any positive advice or personal stories would be amazingly helpful.