How can I handle the fact that my girlfriend slept with my brother?

So the short version goes, I'm 21 and my girlfriend is 19. We just went on a trip a couple months ago and I had put all the pictures on my computer. She wanted to get them so she came over to burn them onto a CD. She said that while she was looking around on the computer for the pictures she saw some my brother had taken of himself naked. She told me afterwards about it and was like "Wow your brother is really big!" which was weird to hear especially since he's 15. anyways about a week later I caught them sleeping together. How am I supposed to handle this? thanks for any advice!

talk to your brother and break up with your girlfriend

Why are you still even with her? Its your choice how you deal with the situation, but in my book..."once a cheater, always a cheater". Did she have feelings for him, or did she just want to try out what he had? Girls like that are dime a dozen...its just unacceptable behavior. I mean she is 19, and hes only 15 for heavens sake! She obviously wasnt thinking about you at the time!

Just dump her and move on... she is a ho

have her a** arrested for statatory (sorry if that's not spelled right) rape