Being strong is doing whats right for you right now.
It's not really anything to do with staying or leaving IMO.
Lots of us have plans in our heads, but don't follow through for one reason or another, or maybe it takes a while to put the plans into action, it doesn't mean they're weak, maybe the plan isn't clear enough or it isn't time.
Lots of people leave but it doesn't mean they're neccessarily stonger.