Can someone explain this?

Me and my partner have an on and off relationship for 4 years
Everytime we break up, we talk crap about each other to our friends, family…
But then 2 weeks later, we make up and be all lovey dovey
he's mainly the one always chasing me and wanting to get back together

Why do we do this?
Why do we talk smack about each other but still want each other?
Is this weird?

I know its toxic but….
Can someone explain this?
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