Is it toxic if two people keep coming back to each other?

And I mean alll the time. They block or delete each other after an argument, then out of the blue they get a text from them a few months later. It’s like they are giving each other breaks and coming back to see if they matured or to see if they’re doing ok? Why do they keep coming back to each other?

Is it toxic if two people keep coming back to each other?
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