You Dream Cheated on Me last Night!

Is it rational for me to be angry at my boyfriend for something he did to me in my dream last night??

Apparently, YES.

Because I was angry all day about it. I had a dream last night that my boyfriend was meeting all of these girls behind my back and I found out about it by looking at his facebook.
So I'm jolted awake from this awful dream by his crazy dog at 6am this morning because I'm currently dog-sitting while he's out of town and the dog desperately needed the great outdoors. I'm outside in the dark with a mean case of bed head and I literally feel heavy with sadness about it.

I know it's residual insecurity left over from my finding out he actually did cheat on me once this summer when we were long distancing while he worked across the country, but I really hate it!
He's moved back so we could work on our relationship, and honestly things have gotten so much better and we're doing well. But then BAM! as soon as he goes away I'm having crazy dreams that leave me feeling nauseous all day long. :-( And to make it worse, he forgot his phone today so I couldn't talk to him early on and "diffuse" the feelings so to speak.

I mean...sleep is pretty signifigant. A person spends like 1/4 of their lives asleep, so where do they go exactly? Maybe our spirits leave our bodies and go into another realm. I know that sounds "far out" but I'm sort of a "far out" girl. So if that's true, then dream boyfriend was breaking dream me's heart all over again. *sigh*