Are obsessions necessarily always bad?

Not wanting to be discovered if I post under my ID, I'll admit this anonymously:

I'm not sure if this is even love anymore or just my own idea of love. He used to attend my HS for the first 2 years. It's been slightly over 2 decades later and I still think about him sometimes. Over the years I've been viewing his FB profile pictures (not always though, sometimes) and imagine I had him, imagine the life I would've had if he had chosen me. I guess this will be my one obsession till the end. I never stopped admiring, melting for him. Probably never will.

However, this isn't affecting my work life nor other aspects. I have no problems meeting people and going out on a date if another guy ask me out. Are all obsessions necessarily bad or can there be healthy obsessions? I don't do anything else and I'm obviously never going to tell him that, no way. Even though he's on my FB list and we rarely ever text, this will be just my forever fantasy.

So are obsessions necessarily always bad or not?

Are obsessions necessarily always bad?
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