It's interesting that normally this would be told from "Amy's" perspective and "Brittany" would just be the bitch, and there would be no question that "Frank" would end up with "Amy". You know?
However, as someone who is and has been for a long time in a relationship where there's absolutely no trust at all, I can honestly say that it's not the end of the world. Though it does seem like their relationship only exists for the adrenaline high of the fighting.
I enjoyed this chapter, update soon.