Me and my boyfriend have been together for four years but for the past six months have been very up and down. Last night I looked on his phone (after seeing him type the passcode in so knowing what it was) and found that he had Tinder. He works abroad a few times a month and I found evidence that on many of these trips he has messaged random women. One of them he has asked to come to his hotel and actually given the name of the hotel too. They agreed to meet the next day but the next day he messaged her to say he was working late so couldn’t. Of course the point is that he would have done, had she said there and then I’m on the way then I’m sure it would have ended in sex. He was messaging me at the same time, sending me photos of his hotel room. I don’t know what I feel. Disgust, of course, but I’ve said nothing. I feel like I’m biding my time but I’m not sure what for. The most recent message is from 2 weeks ago. I know I should just leave but don’t feel like I’ve got the strength to confront it.