To be perfectly honest, I'm not sure sending a picture of his marriage certificate with a frowny face while he's getting it sourced sounds all that terrible, but I don't know the entire situation.

However, as Christina mentioned, I really don't see a reason why he would need to be casually talking to her outside of divorce proceedings. You've already made it clear you aren't a fan of them talking...how are they communicating and how often does it happen?