Is it love or is it pity?

After breaking uo with my ex-fiance I think I did him wrong although I know I didn't and other people tell me so too.But everytime I talk to him it just break my heart to hear him cry and be sad.I hate to get off the phone with him knowing that he's relly hurt but despite it all I still don't want to get back with him because everytime I think about that relationship I only think about the way we use to argue and how depress I would be after we argue.Sometimes I'd wake up in the morning and not go to school and stay in bed the whole day.I would break up with him for a day or two abd go right back at it or take him back the minute he asks but I finally made my final decision and feel guilty just for the fact that I don't really feel moved by his words and although his crying is not enough to make me go back I still feel guilty at times but I don't even feel the same way.I wonder sometimes how can I get back with him if not sure of my feelings for him anymore.