Search Results: other person is breaking up with you

My ex and I seemed to be very in love - we would hang out all the time and spend tons of time together and do special things and he would almost always take me when he went to hang out with his friends. We were together all the time. Then he went to a wedding and when he got back from it all of a sudden he acted very strange and he said he wasn't sure we should stay together because he could never see us getting married. Mind you we had only been together for a matter of months. Things went downhill from there and eventually we ended things. My sister is convinced he broke up with me because he was scared. I don't really know what to think. He was on the fence about breaking up for a while because he said he "doesn't want to lose me." He also said I am still his best friend. But he said I am too slow at getting ready for things and I get stressed about things that aren't a big deal. He still contacts me and tries to hang around me when we are in class together. My other friend thinks he wants to keep me available so he can try to still sleep with me because he's said the sex was really good and he's still addicted to having sex with me. I just don't know. So I want to know if my sister could be right or not.