Part of all kinds of brain functions.
So everyone could have an obsession from time to time. Not just bipolar.
I get that way, when I can't find something or someone. Like online.
Anxious feelings set in and it can get out of control for awhile. Then ,if I'm stable, I'll just give it up after it starts driving me crazy.
Never stalked anyone or made too big of an a-hole out of myself.