Is he trying to make my friend jealous?

Why not ask your friend? Seems like something happened between them that got someone upset. Sounds like he is trying you on for size now. Basically, making his rounds through the ranks of girls. Do you want to be "just another girl" afterwards, or do you want something more? Why get so serious about any of this anyway? You are very young (your profile lists you as Under 18), and there are millions of boys out there to just meet, become friends with, hang out with, etc. Why limit yourself to just this guy who obviously has something going on since your friend will not even talk to him. Again, I say, ask your friend what happened. Hopefully, she will honor your friendship more than her past with this guy and tell you the truth. Good luck.