On staying friends with exes

If you stay in touch with your ex, if you try to be friends, you still have to be careful. From time to time, in an otherwise friendly chat, you might find yourself having this conversation:

“So, how was your weekend?” he asked.
“Really fun, I hung out with [list of mutual friends].”
“Oh, really? It was fun?”
“Yeah, [male mutual friend] cracked me up all day long.”
“Huh, you and [said male mutual friend] get along now?”
“Um, yeah. When didn’t we?”
“Oh, well he talked some serious shit when we broke up.”
“He did, eh. Really? Like what?”
“Oh, just what a fucking bitch you were all the time. I was all, ‘Whatever. I don’t care what you think.’”
“Huh. Awesome. Thanks for sharing.”