@idknow,
Right, don't bring it up with her.
Every relationship is a matter of give and take, mutual trust, and hopefully more good times than bad. If you both care about each other and have a good time together then the only thing you need to work on is the trust part.
I don't know how old the two of you are but I'm guessing you're teenagers or young 20s, yes? If so, you shouldn't be thinking in terms longer than this weekend. You aren't at the point in life where you're interested in settling down (I hope) or happily ever afters so look at how the relationship with your girlfriend feels to you today. Is it good? Good. Make plans for the weekend. Next week do that all over again. One day or one week at a time. If all of a sudden you answer No, it isn't good then step back figure out why and make it better or break it off.
You're young. It's about good times and fun. Enjoy yourself until you don't. Do not look past this week. Next week is a very long time from now.