Had this dream more than once, and weird enough, the dream never had the same people in it:
Best Friend with the Girl I've a crush with. Very passionate kissing sit or lying down along with other friends of mine, normally a circle of chairs, probably meaning they have their circle of friendship and I'm out of it, and if it wasn't enough, my Best Friend mating with that bloody girl. I'm hidden and paralyzed, like if they don't know I'm watching and I couldn't move.
Happened at least twice, old best friend with old crush of mine, and then again with different best friend and different crush some years later. Happens the 1st time it was true, my (supposed) best-friend was plotting to steal the girl from me, and the girl after i said this was impossible said she never wanted him (damn!), and most of my friends were against the fact of me having that girl, saying she was a cow. What's wrong with this world, sex cows are the best. Way to go dreamworld.
The second time, I'm not sure, never got the girl (she already had boyfriend, that didn't throw my crush away...damn!). Well, he never did. So bad assumption dreamworld!