He keeps hinting he wants out...but then says he loves me and wont' leave.?

My fiance of two years (I want to get married after I graduate) has been unhappy ever since he came back from Qatar and we started living together. He complains about the house not being clean (even though we live with three other people and I'm the only one who does any cleaning). He says I've changed and that I'm not the same person I used to be, the one he fell in love with, and when I asked him why he proposed, he said because it seemed like a good idea since we were going to be living together, he wanted my parents to feel comfortable. We've been having fights and arguments where he hints at leaving. I've seen emails he sends to his friends saying he is confused and doesn't know what to do, or that things have been tempting him a lot lately. He even talked about me to his ex-wife. I have been feeling insecure and upset about this, and am starting to think I should just break it off and save myself a lot of crying (which I have been doing a lot of lately), but I am still very much in love with him. Any advice? I really don't think there is going to be an answer...but advice might help.