First the past week or two I've been having dreams that have common themes that involve my girlfriend. There are three different dreams that stick out the most so I will give an explanation of each.

1. I dreamed that I broke up with my girlfriend, and then I was in a restaurant that I would frequent as a child. As I was walking to a table, I saw my girlfriend sitting with two other guys who were hugging and kissing on her. I spoke to them, but I can't remember what I said.

2. The next dream was a little more bizarre. It took place in a dimly lit bedroom. In this dream I was about to have sex with a friend of mine, and no sooner than we began my girlfriend walked in. She wasn't angry, but instead seemed totally fine with it. A few doors down from the room I was in, my girlfriend was having sex with a guy who she kissed in real life a few months after we started dating.

3. I had this last dream this morning before I woke up. It took place in the same house as the last dream, but it was a lot brighter. I entered the living room and I saw my girlfriend talking with another guy. Nothing was going on, but I felt like I had caught them in the act. I remember feeling very angry- screaming, yelling, and right before I was going to hit the unknown guy, I woke up.

Normally these dreams wouldn't worry me this much, but the fact that I've had them within days after each other is a little unsettling. The emotions I felt during them were extremely intense. I felt crushed, guilty, betrayed, angry and confused. I am not trying to turn this in to a relationship advice thread, but I would like to have a better understanding of why I keep having them.

Since I've been having these I'm starting to worry that she may be cheating. She is friends with a co-worker (I've known this guy for years) who is known for getting with his friends girlfriends. She used to claim she didn't want anything to do with him, but now she talks about him constantly and tells me how much she "gets" him now. Knowing his history, and knowing that she did kiss another guy while we were together worries me.

As for the restaurant scenario and the instance where we were both sleeping with other people, I haven't a clue. Any ideas?
Thanks!