Most Helpful Girl
He could be trying to make you jealous or not. It really is impossible to say but what I can say is that your best friend is acting shady as hell. If she is telling you one thing but acting in another way you need to be real with her and ask her what is going on. If she loves you and cares for you she'll listen and be honest. If she genuinely has feelings for your ex then she should at least wait a while till you're done healing from the break up which is still pretty fresh and new.