Jewlz,
Having read your whole thread, I admire your emotional honesty, and ability to verbalize all the feelings and thoughts you are having throughout the ordeal. You are not playing any mental games with yourself, or with him, and you are an emotionally "whole" person.
Your ups and downs are perfectly normal, and a big plus is that you know what is going on inside of you (or what WH is doing) to cause those ups and downs.
You're honest with yourself about still loving WH, and hating him for the pain he is causing by having an A.
To give yourself strength:
When your WH is nice to you or inquires about your well being, and you begin to want to respond back because you L him, miss him and the way things used to be, remind yourself what he is still currently doing: he is not living in your home because he is involved with OW.
By exchanging friendly texts with him, you are allowing him to have his cake and eat it too.
It is obvious he is beginning to see some of the havoc he has created, and now he wants to have an ongoing friendship with you, even while he is still with OW. He is beginning to realize how horribly he behaved toward you, and some of your pain.
However, he has shown no hint of true remorse, or of wanting to leave OW and wanting to be back with you. Remorse is not the same thing as guilt. Remorse means that they are willig to take full responsibility for their actions, and do whatever it takes to help you heal from the pain they caused. Your WH has not gotten to that point, although he seems to be getting some of his conscience back.
When you want to reach out to him, or respond to his inquiries, remind yourself: Do you want to now become the OW in his life, or do you still want to be the only woman?
As of now he still has has OW and you. Your conditions have not changed, but his being nice to you is weakening your resolve, thus pulling you back in to the triangle.
It isn't fair to you for him to pull on your emotional strings, by emailing you about personal things.
You need to remove yourself from the picture. That doesn't mean you have to behave in an ugly way, you just have to maintain your boundaries, and refuse to now become the OW in his life.
Tell him the truth, that you L him still, and miss him, wish that things were the way they used to be, but that he has clearly chosen OW and needs to focus on her, so you can begin to rebuild your own life without him. Tell him that you aren't going to talk about personal things with him while he is in another relationship. Tell him you aren't willing to become the OW now that he has left and is with another woman. He needs to keep all communication strictly about business.
If the fog is beginning to wear off, and he realizes that you aren't fighting for him anymore, but you have accepted he is with OW, and you are not willing to become the OW in his new relationship, it might help more of the fog to lift.
Your mother is so wonderful for being there to help you during this time. Don't feel guilty for leaning on her. That is what family is for. When you are able, do something nice for her. Tell you how much you appreciate her now. I am saying this because I had noone to help me, except friends. My parents have passed away, siblings live far away and we are not close. FWH's family are messed up, cheaters, users, or liars, so I didn't bother telling any of them...they would have made excuses for WS behavior and blamed me. You are so blessed to have a mother who is willing to help you.
(((((jewlz)))))