What does it mean when a guy asks people about you?

i had a thing with this guy for a while, said he loved me and wanted to be with me.. then he cheated. and went of with another girl but always acted like he still wanted me... he would ask me if I wanted him and told me he wanted to stay up with me and talk to me all night, he would stutter when he would try and talk to me (other people noticed too) and would show you to my best friends parties and ask me why I wasn't there... I recently found out that he would ask people I barley talk to if they had heard anything about me lately.. but he has a girlfriend.. what does it mean?