Finding their "love journal" in the trunk of H's car (they used it to write their "love story" to each other). Gross.
Finding movie tickets in the laundry to a movie I didn't go to (after we'd been slowly making progress on recovery and just returned from family vacation). The conversation went like this:
Me: What did you do Sunday? H: Nothing, ran errands. Me: Hmmm... didn't go to a movie? H: Uhhh... oh yeah, I did. Me: Who did you go with? H: Who do you think I went with? Me: OW. H: Why do you think that? Me: Because you're giving no reason to think otherwise. H: Oh yeah... I did. Me: Click (me hanging up phone)