Man this happened to me and i was in love too...
But you know what i was nice and played it easy.. I went back and acted normal and she never knew i found out.. So next day she was sleeping and i called immigration on her dad and got him deported...

Then she likes to invite friends so i decided hey lets get drunk.. So we drank and when we were drinking she wanted to go to sleep so when she went to sleep and i laid next to her i waited till she was half asleep and got up and started messing with her friend...

Drunk girls give it up fast so we started fucking and i picked her friend up and walked to my bed and started fucking her in front of my cheating ex...
Man did that night go good.. Hahaha to watch her cry while fucking her friend and when i was done i put my clothes on and got my packed bags and went to my parents house and she was blowing up my phone asking why...