am i being used? whats going on here? guys and girls opinions please?

[kay babe]

Me and my EX have recently become friends again. Neither one of us like the other one. The past 2 weeks me, him and his best friend have been hanging out and going to parties and other fun things. Me and his friend really hit it off. We get a long great and he really opens up to me and it awesome! But my ex is pissed because he saw us making out, NOT SEX. The day after we all went to breakfast and his friend paid for my meal! I thought that was nice. But now neither of them have talked with me since that breakfast on sunday.Im worried that his friend will not talk to me anymore because of my EX. They have only been friends for like 2 months. I just dont know what to do. His friend asked for my number before my ex got mad. but i didn't give it to him yet. we were supposed to hang out on thursday night..i haven't heard from either of them.