Why do many people try salvaging rocky relationships if you don't even have kids with them nor going to marry them?

I've seen this many times. A relationship with little to no trust and/or drama. It can be as a result of lies, they or you cheated, you got disrespected, or too many overheated arguments or whatever other reasons. Yet so many try to save that relationship and might even go to ridiculous counseling sessions or try make-up sex.

That relationship clearly already failed and just being intimate with them isn't a strong foundation. That solves nothing. Afterwards, you'll still have the issues with them. If you don't even have kids with them and it's likely never going to proceed towards marriage, what's the point of trying to hold on to such relationship? Besides lust, what else is there to it? Or do one of them really blindly believe the relationship will get better and they'll have kids and marry them one day?

Why do many people try salvaging rocky relationships if you don't even have kids with them nor going to marry them?
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