Reacting to or recovering from an unhappy experience, especially the end of a love affair.
For example, A month after breaking up with Larry, Jane got engaged to Bob, a classic case of being on the rebound .
It's easy to assume that once they've finally healed from the breakup, they'll look to you as the valiant goddess who swept into their life at just the right time to make it all better, but odds are they'll just sort of forget you exist.
If you can barely squeeze in a moment of actual fun between all their histrionics about their ex, run, don't walk.
Maybe you're being told all the time out of the blue that you're so much better than their ex, or you can tell they're silently keeping a running tab between you and them.