Why is my ex-situationship mad at the fact that I don’t want to be friends after ending things?

I was in a situationship for five months and he did not want to commit. I decided to end things and he is hell bent on being friends. I don’t care to be friends because I’d like to move on with my life and find someone that actually wants a relationship.
Why is my ex-situationship mad at the fact that I don’t want to be friends after ending things?
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