6 Answers

I think you are being over sensitive......

Depends on the source you heard it from. Some people are not well-meaning. I would ask her directly. See what she has to say.

you should talk to her , because it might not be as bad as you thought, or it might have been a joke.. you need to know the content before you are judge and jury ..  hard feelings can hurt your relationship if there are kids involved .. talk it out and go from there ..  good luck hon

She's your Ex for a reason. Do you need the abuse from an Ex? She may still talk and laugh about you but you won't be around to know about it. Move on and away from any "friends" who may be laughing with her. 

Do you like drama?

Ducky

Then the answer is simple. Find a new hobby.

you have to ask?  You do not need peaple like that in your life. Cut her off.