When you were talking to them you did it out of a place of concern for them and not out of a place of wanting to take revenge on your ex. I also think that you told them because YOU would have appreciated your friends telling you if someone you were dating has issues commuincating. Did you see them this weekend? Is that what has brought this back up for you? If the friendship is meant to be they will come around. You made the best desision you could with the information you had available to you at the time.
As for your ex talking about you and rolling his eyes behiend your back, that's part of the reason he's an ex. He's the type of person who will do that. Try not to take it too much to heart. Does it matter what he thinks anyway? You're a good, caring person with tons of people around you who love and respect you. If he doesn't, so what, that's his loss.
Everything will be ok in the end. If it's not ok it's not the end.