What the difference between a bd or bm and a ex

[Cel 510 kid ados forever]

I say this because nikkas on here say a bd have lifetime access to a woman cause they had a kid.

So can her ex even if they didnt have a kid she can go back to him and he can still be smashing. So what the difference is my point

 

[An ashy lil fap hand]

4?

 

[Cel 510 kid ados forever]

4?

Meaning what