Why do I waste my time wanting and overthinking about people despite knowing that they're a terrible match?

I am a loyal, stable yet a fun person.

I fell for someone unstable, judgy, flirty and fun person.

Only good trait about him is he's sometimes kind and caring.

He led me on but now still I'm overthinking about what if he ends up with my friend?
They both are growing close these days.

He used to treat me as special
BUT HE diverted his attention towards her since the day she wore revealing clothes and seduced him.

I know I should throw both of them off down the gutter and let them live happily ever after after messing with me.

But still I wonder : WHY?
WILL HE FRIENDZONE HER?
WILL THEY MARRY?
WILL THEY BREAK UP?
WILL HE LOVE HER FOREVER OR LOSE INTEREST?
Why do I waste my time wanting and overthinking about people despite knowing that they're a terrible match?
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