What would you do

What would you do.. so my husband went to meet a work colleague during work hours and asked if they wanted coffee.. I saw these messages and I'm not angry at all but I kinda asked him in a way that did he meet her and jokingly said did you get her coffee as last year he met up with a girl he always liked she came to work at the place we live and he went behind my back to meet her.. I found out.. this time around he's deleted those messages from his phone and they didn't delete from his watch so I have the proof and he said he didn't ask if she wanted coffee.. how do I approach him today with this proof knowing me lied...