He's dog

and dogs never change .. they just try to 'get over' on weak women again and again.
When he's done with you .. he will move on to the next 'victim' but if there are no more victims for these sort of men to be with they will have to change .. or be alone. Alas .... there are so many victims so eager to volunteer for the position of 'doormat' out there that he never has to change.

That's the problem.
This is EXACTLY how women get entangled in abusive relationships. (Read the zillions of rediculous stories on the forum alone.)
- The guy does something wrong .. the girl knows he's wrong but because she is lonely, has low self esteem, whatever .. she goes back to him.
- Guy lies and continues to cheat or disrespect her .. she tolerates it because she think she's put too much time into him to let him go.
- And the crap just escalates because he has no motivation to change is behavior .. as he knows you will except it. DUH!
- Meanwhile the girl just feels worse and worse about herself and sometimes gets caught up in other damaging behaviours like overeating, drinking, sitting home alone, suicidal or maybe she gets violent etc...
There's no telling where this will all end ... but in all the cases I have watched on talk shows and seen in real life .. the guy NEVER just takes it on himself to stop this bad behavior and suddenly start being a good guy. Never happens. Again, what would be his motivation?
It's on you .... and I could predict that in a couple of years you will be making a post about some ratfink man that lives with you and you can't leave ... because you are afraid of him! Gosh, how many times have we read THAT story on BHM?
THIS IS THE WAY Domestic Violence situations START. DV situations don't START with the guy hitting you. Nooo they start with the way he treats you, then it's the words he says to you .. then one day he hauls off and hits you across the face and THEN you realize that you are in a DV situation - but by then IT'S TOO LATE!
No, I am not saying this guy will go this far. I am saying that THIS IS HOW DV situations begin.

Nobody goes out on a date with a guy and at the end of the evening he hauls off and pounches you in the face and then expects another date the following week. Noooo because he knows AT THE LEAST you will not see him again .. and AT THE MOST you will call the cops.
No, DV men have to pick at you bit by bit. They have to chop you down to a size that they can manage and when you are broken down emotionally POW that's when they lay their hands on you. By then ... you are to beat down mentally ... to leave. It's called 'Battered Wives Syndrome'.
Again, I am not saying this guy is gonna be this bad.
But in general that's why you cannot tolerate BAD BEHAVIOR from a guy. PERIOD. A girl that has a sense of her own power in this world is gonna be gone IMMEDIATELY if not sooner.

Another sort of girl will take him back and hope for the best.

You have to REQUIRE more of yourself.