How could I have been so stupid?

I've done something really stupid...

I'm afraid to call or text a girlfriend because I don't want them to act weird about it later.

I'm at MMs - he planned a night out with friends, and I'm sick so we were hanging out together until he went to that. I thought I was going to go home, but he seemed to think I was staying the night so I did. After he left I got on the computer to do homework.

I know I shouldn't have. And I tell him all the time that I don't... .but I snooped.

It started because he didn't originally invite me out tonight. He said he wanted to catch up with people he hasn't seen in awhile. But I knew from Facebook (again where I didn't get an invite) that he had invited the girl I dislike who used to live across from him. Who I completely admit to being jealous of. I know she wants him and she's cute enough with enormous boobs which to me equals jealousy. I found a picture of her in his computer trash (yeah, already with the snooping) so I went to his pictures folder wondering if there were more.

Instead I found pictures from New Years 2009 when we'd been dating about 2 1/2 months - when he told he me he blew off plans with friend in New York to go to Europe and visit different friends. The time everyone told me to break up with him because he didn't tell me he was in Europe until he got home on January 4th. I found all of the pictures not just the 3 on facebook - all the ones with him and a girl. And they're not just friends - because they were kissing in some - and then I found others of them in the apartment together also kissing.

On the couch I'm sitting on right now. At the table I've eaten at before.

And I don't know what to do. Because I was with him. I was dating him and sleeping with him.

We celebrate 2 years in 2 weeks. We booked a trip going to Asia together in month! (Yeah, that was supposed to be a happy excited blog post once the visas go through). We have plans to go to Europe in the spring.

I tell him that I don't snoop. And for 2 years I didn't. I know that this is what happens. I'm upset and if I bring it up I'm a snoop. And if I don't I just fester. Even though it's over and he loves me.
But here I am crying and he'll be home soon and I don't know what to do.