Hyperfixation on a person

How do you break that type of focus or prevent from happening? It gets weird for me, like really weird. I didn't even realize it was a thing until recently. But I have noticed it's not tied to feelings and this has been a lifesaver of sorts. I just don't get why it forms with certain people and not others. Just wondering it if could be a trigger even.

Any advice or relating experiences are greatly appreciated!!!