<human>: So I have been together with this girl for about over a year now and everything is mostly fine. Until recently i discovered she is sending voice messages to this guy on Facebook who's on the other side of the globe. I live in Europe and her online boyfriend in America. 

I know her FB password and she knows mine, so i just randomly logged in one night and discovered that she is doing some dirty talk to this guy who apparently they had a online-relationship 3-4 years back before she even knew me.

Basically it's him asking for photos, saying he loves him and he will come to my country and meet her and he is saying when they meet they'll fall in love with each other and so on. She is talking dirty to her that she is "Ready for him". Also the guy said he wants to beat me up and so on and she isn't really saying anything against it.

I really do love her and i feel so much cheated on, i know it's some online stuff but it doesn't matter, it just keeps breaking my heart she isn't 100% commited to me. It's so hard to hear her staying up till 4 in the morning talking to this guy on FB voice chats. 

I really don't know how to act cause it's a dick move in the first place to log in to her Facebook, she also deletes their conversations each day, but they are talking on the next. Any general suggestions/ideas/opinions are welcome. Help !

(Sorry about my English if there are some errors, I'm not a native English speaker.)

Can you give me a shortened version of the text?
<bot>: Girlfriend is having a online-relationship with a guy across the globe while having dated me for over a year.