What to do when someone talks behind your back?

Recently ended a 6 month relationship with a girl who happens to be friends with two of my closest friends. I haven’t really talked to either of these friends about the breakup but recently overheard them talking about how i’m an ass. They must have been comforting my ex girlfriend. Hearing these things coming from two of the closest friends I have hurts alot. What should I do? approach them about it? ignore it? I don’t want to do anything to upset them as I am going through a rough time right now and have no one else to lean on. Thanks for any advice