| Though it's never cool to be mean to anyone, (I recommend avoiding someone before doing so) I imagine that your ex is this way towards you simply because you hurt him. Did you and he break up for another reason or did you drop him for your current guy, which is mutual friend? You stated that this is what your current guy did with his ex...left her for you? Of course you had a right to break up, but come on...how would you feel in the same situation? It's been a year ago and may not bother you at all anymore, but the fact that he still has to see you may bring the hurt back over and over for him and therefore he is acting out towards you.
Perhaps the best thing to do is ask him what's wrong and have a talk with him and clear up any lingering bad feelings that he has. If I were him, I may not want to hang out with my ex and the person they are now dating either, especially if it was my friend. That's not always cool with some people. In fact, having been in your ex's position recently, I know I wouldn't want to hang with my ex. He in fact dumped me for another. Sorry if it's all harsh, but it may well be the case. If you can't have a civil friendship with one another, perhaps it's best if you hang out at separate places. It may be easier on everyone. I hope you all work it out some way. Good luck. | 
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