He says that it kills him that he has hurt me like this..
He is a liar. He has compartmentalized this. It may hurt when he sees you, but beyond that? He's doing what he wants and enjoying himself.
You say that when you cry, your child thinks it's because you miss daddy. So when OW is living with Daddy, then what?
I don't mean to be harsh. You deserve so much more than this. Your husband is a selfish cheater who, right now, is being allowed to live with his girlfriend while telling his wife how bad he feels. If he felt bad, would he be moving her in? He wants to keep you waiting.
You deserve more than this. It's up to you if you get it or not, but you do not deserve to stay in this pain.
And I can promise this - your husband does not deserve to have ANYONE waiting for him, or loving him. He's so unlovable. And he knows she messaged you with such hateful words? And still he's going to live with her huh?
Do you want this woman around your daughter? If she goes to visit her father, this woman will be there. Your H should not want her around simply for sending you a hateful message. You are the mother of his child!
I"m sorry - but again, this only goes on for as long as you allow it. There is no happy ending here. If things don't work with OW, and he takes you back, will you be happy knowing that he wanted someone else there but is settling for you because that didn't work? He must choose you - anything less will have you miserable for years.
I'm sorry you are hurting, I am, but you have the power to end this pain. Your H will not stop as long as he has both you and OW, and right now he does. The only way to change that is by you walking away. You can do this. YOu should want ore for yourself. He is not being a loving husband, and you should not accept anything less than a loving husband.
I wish you peace of mind, and clarity. I pray that you soon realize that your H won't stop, and that you must be the one to walk away.