Dear Stuck 808 and meliru

Thank you so much for the wise counsel and feedback; Its true that I need to start putting myself and D first.
I have just woken up from what was a terrible nights sleep.Last night my H and I had an altercation; my fault probably in that he asked me how I was feeling post hospital and then he was yawning and looking at his watch, ready to leave,as I was getting ready to answer, This upset me and I realised for the first time how little he truly cares about me now.
I do not recognise him. He is living with OW, there are changes in him; taking more care in his appearance; less stress in his face (surprisingly), hair is washed everyday etc. And I realise that he has moved into a different world and does not love me anymore.
I guess I always felt that no matter what happened we would have a level of care for each other that was indicative of being together for 10 years.
I was shocked by his response to, what is for me, a very upstting and difficult time. I was hurt and said to him under the current circumstances I didnt feel that I could tell him; he didnt seem to mind either way and agreed. I then remarked how sad he situation was He responded by saying hat he has told me time and time again why he couldnt be in a relationship with me any longer, and why couldnt I understand this. this was hurtful; I do understand, but obviously am not in the same place as him. I care and he doesnt.
I guess what I have finally realised is that he is gone with no hope of return. It hit me like a brick and I am struggling. I have tried to have hope but I realise that he is gone; is in love with OW ???? (would love thoughts about this) and has happily created a new life for himself where I dont feature in any way; and where I have no rights to know anything.How do people detach successfully, especially with kids involved.
I feel so wounded, he may be happier without me?
I want so much to be albe to establish a new life for myself and my daughter but I dont know where to start.
Help..........