DH went out last night to the pub with friends. When he came home later than usual his top was covered in foundation. I looked at his phone. Yes I know but I was a few glasses of wine deep and he was acting weird. Anyways, found messages from a woman he worked with "hey what you up to" chat quickly progressed to you out tonight? to him suggesting he come meet her and her friend in the local pub as his friends were going home. AIBU to be raging about this? When confronted this morning he is saying oh she's just an old work friend, nothing happened etc. What would you do?