Why do some single fathers, still mess around with their babymama?

Like, I get, if they're in separation, and they don't have a bad relationship with each other, but yet they DON'T see eye to eye on certain things. To, many reasons, why there not together. So for the sake of there child, they still raise Them. It's call co-parenting. But anyways, there has also been a few guys that I have met, here and there. And they call themselves a single father. But as time go on. I always find out that they're still involved with their baby mom or living with them and there is still the possibility, that there still sleeping with them. Like, If they still have love for these women or some type of attachment to these women. who is raising there children. Then, why not work on things between you and that person, instead of leading others on. ? But what's y'all advice?
Why do some single fathers, still mess around with their babymama?
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