Derrick is the one who started it i think, he is the abusive alpha male. Samantha has a high sex drive and when derrick tried to hit on her she fell for it. Also she is an unfaithful narcissist. Now the problem is derrick is single so he wants samantha. Francis is in danger if he confronts derrick he is dead. And samantha will show no emotions or feelings for francis. But after revealing it to francis you can't find samantha in the woods so things maybe cool or they started to meet somewhere else. Dev could have show some mercy towards francis or teach derrick a lesson