DH went out on a works do on Thursday night and today when I was using his phone a message from one of his colleagues popped up and I accidentally opened their conversation (iPhone so it was hovering at the top and didn’t know how to get rid of it). There were a few from Friday discussing the night before, DH said he had been quite drunk and colleague said ‘yeah I thought you must have been, you spent like an hour telling Megan how much you loved tits and how nice hers were’ ‘Megan’ is one of their colleagues 
. The rest of the conversation makes it clear that nothing actually happened, DH basically said he was cringing at the memory and colleague said it wasn’t a big deal and that she hadn’t seemed bothered.
I am obviously upset, I told him straight away that I’d seen the messages and he didn’t actually seem that worried I don’t think he thinks he did much wrong. He insists nothing happened with her and I do trust him that he hasn’t/wouldn’t do anything physical but hate the idea that he’s now going to work everyday with a woman that he’s had that conversation with.
Would you consider this flirting or ‘normal’ drunken conversation and would you be upset or am I over reacting?
He said he barely remembers it so can’t tell me any more but I am also worried about what else he could have said in a long drunken conversation with just her