Trust!,

It's pretty hard to help here because you didn't point out any defect in your relationship with her[girl], she might be clean and you might hurt her unnecessarily if she discovers that u don't trust her @ all. Simply access things the way it is, so far she is not seeing another person, and she is commited to ur relationship, u need to loosen up and get closer to her because i believe a relationship shouldn't go on without trust.