So my boyfriend is a graduate student, he had just finished his thesis defense and was done with classes, I had not finished my classes and had some to go to the next morning but he wanted to celebrate that night which was fine with me. I went home and he invited friends over to his place.

A week later I noticed he kept getting messages on his whatsapp (he had told me he has nothing to hide on his phone and he didnt care if I looked through it. If you want to comment that i shouldnt have looked through his phone dont bother commenting please, that's not what im making this post for.)

I see that the message is from a woman and they have a very long conversation history from before him and I were dating but she was at his party and slept in his bed with him. I know this because he sent her a message the day after the party saying "I didnt actually have to go in to TA as early as I thought, I still could have been in the bed goofing off with your ass"

So after that I confronted him about it and he said there were multiple people crashed in his bed (another man and they all wore clothes). After even more digging he admited that him and her had relations before my relationship with him but they have just been friends since. I told him that I cant believe he would think its okay to have a woman in his bed with him and especially since they had relations before. He has apologized a lot about it but i cant get over the fact that he would think its okay to let a woman sleep in his bed with him or even text her they day afterward and follow up by saying he could still be in bed with her. And I want to trust him when he says nothing happened and there were other people and clothes was left on but it would be so easy for that to be a lie. For all I know he only invited her over because he definitely didn't text anyone else a message like that.

ALSO he moved to another state recently and i went to visit him over the weekend and saw that he told her that he moved and she sent him a voicemail saying that she can't wait tocome wait to visit him. I told him that if she comes and visits him we are going to have a problem. I would never know if she did though.

What do you all think?