First off you should know better than to get in the middle of a committee relationship. You wouldn't want some guy doing it to you so do yourself and your integrity a favor.
Secondly you probably don't want to be involved with a woman that cannot enforce personal boundaries about relationships. Consider her the car dodged when playing frogger man.
"Well, then," the Cat went on, "you see a dog growls when it's angry, and wags its tail when it's pleased. Now I growl when I'm pleased, and wag my tail when I'm angry. Therefore I'm mad."