Why do exes come back after being broken up for awhile?

I was with my boyfriend for 19 months before I finally ended things with him for good. We had broken up multiple times and gotten back multiple times in those 19 months but I finally put a stop to it a month ago. I blocked him on everything because to me, there is no point in keeping his number because knowing him, he’ll try to come back into my life, like he did previously. A couple days ago, he calls me from a blocked number, I didn’t pick up, that day he called me 25 times before I finally had enough and picked up the phone, I told him to leave me alone and that I don’t want anything to do with him but he just doesn’t get it, he kept calling me the day after telling me how he’s not doing fine without me and how he misses me and all that crap, but when we were together, he didn’t give a crap about me. I was being really cold towards him but he just doesn’t give up. Why is he doing this now? Is it the fact that I don’t want anything to do with him?
Why do exes come back after being broken up for awhile?
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