Girl: I grew up with this guy and I've love him for most of my life. I took him for granted and it was too late for us to be together. I never had feelings for anyone else until I met you.
Guy: I'm sorry, I can't be with someone who's fallen in love with someone else besides me. I especially cannot accept the fact that you will do practically the same thing for me and another guy. That doesn't make any sense. What's the point of being together if you're treating me like the other guy? Just forget it.
Girl: I understand. Just know that, I'll always be there for the both of you regardless if we're together or not. I'll travel to another country if either of you ever needed my help.