Why do people stay with a partner when Presented with poof of cheating or their partner Attempting to cheat?

Anonymous
A girl over snapchat front my town told me she was single and wanted a relationship. I looked her up find out she was in a relationship and told her she wasn't a good peeson. I started taking screnshots of the conversations, and then she started deleting them fast. I sent everything to her boyfriend, but he's still with her. Funny enough, i seen them together in person together the day before i decided to tell him. I also had another ex who cheated on her new boyfriend with me, and we almost got married behind his back he's still with her. The guy whloe family aware of her cheating as will
Why do people stay with a partner when Presented with poof of cheating or their partner Attempting to cheat?
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