Not going into the situation of your dealer and ex-girlfriend because of the fact that it's a past relationship and moving on is everything.
Can you think of a reason why she's considering leaving you? Express all your emotions, cheesy shit, but make it all serious. Don't just let her go and post on a forum about something, take her out, try everything to make it work again.
Shoot me a message if you ever want to talk more in-depth, I've been through quite a few shitty relationships.