Can a sociopath be selective and permanently be nice to some women and abuse others?

The problem might not be him but the relationship you two have had together. You both have a history of love, deceive, abortion, hurt and drama. Even if you'd try to make it work, it'll never be the same again. The other girls see him differently coz they don't know him the way you know him. It's best to let him go and start off fresh with someone else.