I have been with my boyfriend for about six months.
He is my first love and the only boyfriend I've ever had.
He, however has had two other girlfriends (first one nothing happened, only dated a month), and his longest relationship was around six months and he had slept with her, which is understandable and natural.
He was open to me about this, and I felt sure that that girl was his only sexual partner, so a few months into the relationship everything was going well, I felt comfortable, and so I decided that I wanted to have sex with him too.
I had asked him if he had any STD's because it was important to me, and he said that neither him or his ex did, and since it was only one partner I trusted it and didn't think about it.
Anyway a few months later, and I don't remember what we were talking about, but I casually asked him if he had had a one night stand before. He said yes. I was initially shocked, and then asked for details. It was several years ago, and they actually didn't end up doing anything (but since they were going to and were almost there he counts it). I was hurt that he didn't tell me this, so I was sulky for a few days, but I got over it since it was more than a year and a half ago.
So, we trust each other, so both of our phones are always free for the other to look at. Yesterday, I got a text and jokingly acted like it was someone important (he could tell and read it and pretended to be surprised) and in exchange I took his phone and looked through his facebook messenger.
And I found... a girl he had had a one night stand with two weeks before he started talking to me (September 25th, he chatted me up Oct 8th and we were together Oct 28th). My whole world crumbled, as he had a) literally lied to my face SEVERAL TIMES about only having one, and because I could have actually gotten and STD? There are so many reasons...
Anyway, I'm so hurt... on the whole carride home he denied sleeping with her but I finally got it out of him. What to do...
Anyway, he's really really ashamed of both of these incidents according to him. Other than this, we are extremely happy, and I don't want to break up with him