I just discovered this service, and hope you can help me. I'm a grad student (mid-twenties) and was very deeply involved with a man several years older than me. Although it was a monogamous relationship — we had a wonderful and very fulfilling sex life, and were generally very happy in each others company — he was unwilling to make a firm promise not to date other people if he found someone he liked. I broke up with him because I didn't like what this ambiguity was doing to me — making me extremely possessive, jealous, etc. We have both been hurting a great deal since then and were planning on getting back together... but he backed out because he doesn't feel able to make a commitment. Part of this is cultural (he's Indian, I'm American), and part of it is probably developmental, as he didn't start dating until quite late by American standards.
In any case, we were considering marriage at one point last summer, and I am still deeply in love with him. He still has very strong feelings for me as well, but I get the sense that the fear of commitment is paralyzing him. I'm at the point where trying to let go and get on with my life seems to be the only viable option, but I'd love to hear your suggestions and comments.