And, for your own sake, walk away from those accusations. I always found that my ex thought that attack was the best form of defence i.e. when his own behaviour was in the spotlight, he would turn it all on me. My response? "We can talk about that later, for now we are talking about my issue with X." And if he continued, I would walk away.
And check out the thread I posted about boundaries. Especially the one that says you can't set a boundary and spare the other persons feelings. That was life-changing for me.