The ex wants me back...

Kate
I broke up with my boyfriend of 3 months cause he didn't visit me in hospital when I broke my ankle and was in there for 8 days. His excuse was he was busy. Then I only saw him twice the following 2 weeks when I was at home. He was really loving and kind and funny when we were together and made me feel like the most beautiful girl in the world. 
Then 4 days ago I went to a bar to meet up with a guy and my ex just happened to be there... I felt so guilty and uncomfortable I blew off the guy to hang with my friends who were also there. Then my ex asked me for a ride home and I said yes for $50 (hehe) anyway we stopped outside his house and he said he missed me so much and forgot how funny I was and how nice it was to hang out and I brushed him off... Now he won't stop asking me to hangout and saying that he wants to talk about us... What do I do?!!!!!