How likely would you girls be to message a guy back if he messaged you with this?

My friend wants his relationship with a girl I've been a match with online to end. I've always been mutually attracted to this girl, and he thinks that if she goes out with me she'll be likely to end things with him.<br><br>I think this would be something bad and I've told him so. But I also don't think she would go out with me. He thinks it would happen. What message would he have to send to her for her to go out with me?<br><br>&#x200B;