Our expert says:
Bipolar Disorder traditionally is a disorder with slower, more ponderous moves of mood, with a substantial amount of time spent in each high or low, rather than referring to rapid and brief mood shifts, which may have many other causes.
The person you're describing sounds immature and unstable in behaviour rather than mood, perhaps manipulative, and responding fiercely but temporarily to changing circumstances. In Bipolar Disorder one's mood shifts unplasantly up or down irrespective of what's happening in life - it isn't responding to events, and especially not to interpersonal events.
You are referring it seems to an EX fiancee who appears to be trying to manipulate her ex fiancee, your bf.
Bipolar disorder often responds well to proper medication ; it sounds like she may have a more unpleasant personality disorder, which often responds less well to treatment - but of course, whatever the diagnosis, treatment is only available if and when she herself considers that there is a problem and sincerely seeks help for it.
If she is in such close contact and so able to manipulate him, their relationship is not yet over
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