Swoon has a point. Trust is an important factor in a relationship. If there's no trust, then you'd always be thinking she's going out to cheat. Simple... no trust... no relationship... either way you'd both get sick of it eventually.
Do what you think is best. Talk to her. Don't accuse her of anything. State that you've only made these accusations because you don't want to lose her and that what she did was very peculiar and has created a sign of distrust.
Good Luck
Evil School!!
May not be on LF as much, due to unforeseen circumstances.
Blame College and Homework for Everything!!
-Fawn