seriously, tell her it is your own damn business...

where was it that she found it and why doesn't she know that gear is expensive?

that equates to you going to her room and flushing her birth control down the toilet if you don't want to have sex or something.

keep your diet relatively the same and don't change your cardio/training routine drastically as you might tend to lose more gains. just suck it up and hope that you can keep progressing or remain constant...then dump your gf