Gets very angry

"WHAT THE HELL ARE YOU DOING?!" she snapped "YOU FUCKING LOSER, GET THE FUCK OUT OF HERE NOW!" and with that she got up from the bed and said "NOW!!" as she grabbed the knife she kept next to her bed.

That was the last straw for him, she pulled her knife on him?! That's when something inside his head snapped and he thought, Fuck it! yet a smaller voice told him to just go, or try to calm her down.

What does he do about Melissa and the knife?