How to break up with someone?

i’ve tried breaking up with him before but he just kept responding with “ i want to fix this” or he just kept saying things like that so i felt bad and we stayed together. after that i didn’t feel the same towards him. i still don’t and everything he does annoys me now but i don’t know how to break up if he’s just going to keep not leaving me alone after i do it?
How to break up with someone?
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