And there are non-bipolar people who do that stuff as well. And there are bipolar people who take their meds and you have no clue about their condition.
Forgive me for being blunt, but it seems to me that you are insulted that she called off your engagement, and even more so to choose to marry him over you. Get over it. Get some help.
The fact that you were able to find a rabbi and ask the question in a way to get the answer you want is no proof that you are right here. You are meddling in thing you have no business venturing and are quite frankly close to stalking. Get yourself some help.