Answer: Because love can’t be turned off like a faucet.
When you love someone, there will always be a part of you that loves him, no matter how badly things turned out. Love is always beautiful, even if the person you loved wasn’t worthy of it.
You can love him and still choose to leave. In fact, leaving can be the most loving act of all, if this relationship is bringing out the worst in you. The longer you stay, the more you both suffer. Releasing this dynamic might be the best for both of you.