Most Helpful Guy
As long as you don't actively attempt to sabotage the currently relationship, I wouldn't worry about it. If you're just friends with her and she realizes for herself that she's ready to end her current relationship because it's not good, then I wouldn't feel guilty about that. If her relationship isn't good, she should probably be leaving it anyway and if knowing you helps her realize that, then that might be a good thing. I just don't think it would be right to actively sabotage her current relationship.