(verb) to hold on to one relationship until another is firmly in hand.
Whiny Guy: Lisa cheated on me with James! And now they're going out!
Friend: Wasn't she going out with Adam when you started hooking up with her?
Whiny Guy: Well yeah, but they were on the rocks anyway.
Friend: She always monkey bars her way through boyfriends. You should have seen this coming a mile away, loser.