If she decides to go with the other guy, you have to tell her
this,
Since you're leaving, don't come
back. I'm not your hideout when you're in a bad spot. Once, you
decided to go, then it's your choice, I won't stop you. Don't turn
back, I won't be waiting for you, even if I am still single. And
remember when you leave, don't ever use me to compare to him. You
chose him, so you have to accept him for what he is.
Basically my advice for you is... get over it.
Ask her straight in her face if she wants out. If you can't bear
her seeing another guy, then just force the answer out of her.
Since she decides to two-time, she got to weigh the
consequences.
