The guy I was seeing rejected me but insists on being friends. Why does he want to be friends so badly?

Despite begging me to hang out him for all most half a year, he told me that he didn’t think we were compatible for a relationship but would like to remain friends. When he said that he wanted to remain friends, I thought that he just meant cordial and not hostile. I said fine and left him alone.

Three days later, he starts texting me again like nothing happened. When we saw each other at a mutual friend house he cornered me and confronted me for snubbing him and giving him the cold shoulder and he keeps calling me back to back. He keeps sending me follow requests on different IG accounts despite the fact that I unfollowed him and he keeps looking me up on LinkedIn.

I don’t want to be friends with someone I have romantic interest in. Why is he so pressed to remain friends?
The guy I was seeing rejected me but insists on being friends. Why does he want to be friends so badly?
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