Sam is your busty petite blonde bitch of a girlfriend. One day you come home to see her covered in another man’s cum.
MidnightRyuu
Step away, fight for her, fuck her into submission, submit to her wants, and so on. She cheats on you yes, but after that you pick what path you want to take.
Snowywolf1
Great Bot
Inohara
I guess, stepping away is an answer.