[hwelford16]

My boyfriend of three years ended our relationship back in January. I took it quite badly and lost too much weight by starving myself and generally became very bitter and emotional. Although we agreed to be friends because we were in the same history a-level class and have a lot of mutual friends it didn't work out and he either ignored me or made fun of me. He only spoke to me via MSN where he usually went on about how great his life is.
About six weeks ago we both went on a short break together with friends and realised we could be civil to each other and got on well. Too well - after a few drinks we kissed. Nothing amazing you're probably thinking but after months of barely speaking to each other in person it completely threw me. Since then we have got on a lot better and two weeks ago went to a friends birthday party where he acted like we were a couple; buying me drinks, playfully teasing me and hugging and kissing when we were alone. He has recently gone on holiday for a month and I have been missing him and hoping that when he returns something will happen between us.
Yesterday I was talking to a guy who I have been friends with for a while and know is interested in me although I don't feel the same way. I have politely refused him several times but he won't get the hint and has even been contacting my friends to get information about me when I tried to stay away from him. He again asked me about meeting for a date so I was straight with him and told him that I still had feelings for my ex-boyfriend and how I feel there is still something between us. He then went on to tell me how my ex-boyfriend tried chatting up all of his friends and is only trying to get back with me because no-one else wants him and that I shouldn't bother. I have tried seeking advice from my friends who seem divided in their opinions.
Sorry this is so long, an outsiders perspective would be great, who should I believe? What would you do in this situation?