Most Helpful Guy
Your ex never treated you with respect and yet you have to ask if seeing him is a good idea? Do you have any reason to believe that he has changed? Has there even been enough time for him to really change? If he is still the exact same guy and you are letting him fuck you despite breaking up with him then do you think that he is likely to respect you any greater than before?
You can't just pretend that shitty treatment didn't happen because it feels better to give in to your cravings, that's a sure fire way to keep yourself tied to an asshole. If he's still the exact same guy as the one you broke up with on bad terms then you might as well just be punching yourself in the face right now because that's how constructive it is to be hooking up with him.
Most Helpful Girl
Why on earth would you feel like your regret not staying over at somebody who doesn't respect you? He always treated you with disrespect, and now this is looking like it'll be a sex only thing. Why would you do this to yourself?
Teach your child how important respecting yourself is, how healthy relationships work and how to cut off people that don't respect you by leading by example. Your kid will be old enough to pick up in all this one day. If you have a daughter, it's even more important, because you're supposed to teach her about womanhood and being a strong secure woman.
Fr though, you're not respecting yourself so it's no wonder you'll be meeting these types of guys who don't respect you either. When a woman doesn't respect herself, those types of guys can tell and will target her. So when this one goes, it's likely the next one will be the same unless you start having more self respect and self love.