I think, to love someone and to love and live with someone for all of ur life could be two different things. Person could change after living together (or after getting married). It's really hard to live 2 lives together. I dated my college for 3 years and she got married with somebody else. I felt so bad that I went through very bad times but now I think and look back those days and I would say that I did the right thing by not getting married with her. We loved eachother very much and still we could easily sacrifice our everything for eachothers happiness but we had so many uncommen things that would come out and could make big things after getting married. Listen to your heart but make decesion from your brain.