My ex sent guys to date me, yet he had an Obsession with me?

My ex sent guys to befriend me, hook up with me for years after our breakup at the same time he had an Obsession over me and became angry because i never really saw the signs of him loving me. What is the psychology behind this? What’s going on in a mans mind to have a sick fetish like this during an obsessive state of mind.
My ex sent guys to date me, yet he had an Obsession with me?
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