As far as you guys being like a married couple try going on cool dates. There are a lot of interesting places around wherever you live I can guarantee you. Try doing something different like going to the childrens zoo, or a nearby town that you've both never been to, or the airport and watch the planes take off. Theres a million fun things to do with your girlfriend that don't involve sitting at one of your houses, not that this isn't cool, but seriously get out there and mix it up.
Don't be so suspicious of your girl. Relationships are tests of trust. If you can't trust her for one night, then the problems in your relationship don't only lie with her.
There has been some good advice on here posted already, but I cannot stress enough, don't try and get in touch with her tomorrow, let her make the first move. Go out with a couple friends and have a blast. See a movie, or just do something fun out (physical crap like playing basketball is probably the best thing you can do to keep your mind off of her). When you get home play some video games or read a book or watch a favorite show, then go to bed early. If you can do all of that and not worry about her I can guarantee you that you will feel better the next day. You'll probably be much more able to talk to her, and if she didn't call or text you on the day that you were out then it's okay to try and call her the next day. Because if all she needed was some breathing room a whole day would have definitely given her some time to clear her head.
But don't take this too far... one day is more than enough