Tbh, they're both in the wrong. Instead of talking deeply Jaehyuk because of what he's been doing or acting, Garam left him. He should have try hard but the reason they argue is coming out of their relationship. It's late to say 'This. This is because of what you've been doing. Leavin, cutting out.' You know, communication is the key when you enter a relationship. But, I agree they should just break up.