I bought a house with my boyfriend last year. Two months after moving in I find a text on his phone at 2am from a girl. He said its a really good friend from work. It turns out to be a colleague who he employed a month prior. He manages a team and therefore I am used to him mentioning names, but hers was never bought up. He had been messaging her every day for weeks long detailed messages.
He reluctantly said he would stop speaking to her outside of work I find out two weeks later he has called her when I am out and continued messaging.
We nearly broke up at this point. He said he wants to be with me forever and will stop speaking to her. She was a temp and left the business anyway two month later in September. We moved on and then at Christmas I offered to pick him up from his Christmas party which was over an hours drive away, in the circumstances he wouldn't get drunk and would be ready waiting when I arrived. He was completely slaughtered, wouldnt come out and then I find a message from a random girl on his phone, who he had been calling when I was waiting outside. Also taken selfies with a random girl. On confrontation it was another girl from his work he had met that night, and apparently gave her his number so she could have the photo...he cant even remember the night. We have started fresh and he has started getting professional help for his drinking. I don't know whether solving the drinking will help regain trust again or if it's a lost cause :(