<human>: So it's hard for me to type this without shaking with rage.

My sister lived in Spain for the past  2 years or so. She got a boyfriend there, who she ended up falling in love with. He was a little bit of an urchin there, and all her Spanish friends warned her about him, but she was convinced they were wrong. They have some remnants of "class elitism" there which is why I think she was so adamant to prove them wrong (we are American).

Fast forward, this past fall she came home for two months before he was supposed to come to America with her for three months on visa. In the period of those two months, he slept with another woman. He didn't tell her. Our family took him in with open arms. Paid for everything and more or less a two-month adventure of a lifetime with her all across the country. Even my tiny little abuelita paid thousands of dollars (even though they are poor) to fix him when he got hurt.

And it came out yesterday that he cheated and lied to her. Kept the lie going and rode on her funds through America. She was devastated obviously. But what the hell. How do I keep myself from killing this guy when I come back home this Friday? He is still here. Is there any way to move past this and how do I make my sister feel better after she is so embarrassed and ashamed for trusting someone like this and being duped? She was going to return to Spain after spring.

Can you provide a brief overview of the text?
<bot>: sisters foreign boyfriend came to US not telling her that he cheated on her while she was home for two months and now I am probably going to take a shit in his food.