[Eternal]

I would have a talk with her about this and tell her how you're feeling. Its important to communicate in relationships so that you're both on the same page.
As for the dreams, they don't really mean anything. She can't control them, so you should trust her whens he says she doesn't have feelings for this guy.
You should try and find ways to spice up your relationship. Go do something you've never done before so that you can have fun together and re-connect now that you're both back at college.