What can be done if a fiance cheats in the woman's house?

Anonymous

My sister was living with her man for 3 years and they got engaged 6 months ago. It's her house and they got 3 cars; 2 under her name before they met and 1 is his. Though he helps out with the bills. They were planning to eventually move out after the wedding and buy another house under both of their names and share assets.

She just found out about it a couple days ago and is still proceesing the trauma. She discovered his cheating through his cell phone. On between text messages, they revealed doing it in the house the last time, inviting the other woman her homemade pumpkin pie, doing it on her bed and taking a shower afterwards; all that happened while we were both visiting our grandmother in hospice. She checked his cell because he was acting different, creating arguments and accusing her of cheating suddenly. She's right now staying over with me. She is very disgusted at what she found and emotional at this moment.

What can she do? The guy (on his day off) cheated in her house, her bed, her bathroom and even invites the woman her dessert.

What can be done if a fiance cheats in the woman's house?
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