I need some advice, I’ve currently put my partner out he’s living at his mums, we have 3 children together and have found out he has slept with one of his work colleagues, I noticed back and fourth flirting well before this and approached him many times and his response was “we’re just friends” he has continued texting her even after I found this out, I decided to try and give things another got (silly me ) so a week after that there was a staff night out and I knew he seemed off after it so I asked him did anything happen and he kept saying no but finally admitted they had had a heart to heart and a kiss, he’s been trying to get me back so I asked to see messages between them to which he refused I kept asking why and eventually he said you wouldn’t like what you would read we have past compliments, his latest stint is txting her and saying we need to keep this work related and they only talk in work. Sorry for the long post but what do I do? TIA