deadly-nedly answered your question: This is a legitimate question meant to gain understanding, not to start an argument.

everyone has done her wrong but aside from that he loves her. she loves him. is that so hard to accept?

Would you “just accept” a relationship where a man beats his girlfriend just because they “love each other?”

No, I’m not drawing the comparison that Finn beats Rachel, but saying they love each other isn’t reason enough to view them as a solid, healthy relationship.