RAI, give yourself a break. It is really hard to detach if you're still living in the same household. If you're in the dissolution process, then your living situation is likely to change soon, and though you may not welcome the change, it is likely to give you more space to detach, which will help. Do you have to sleep in adjacent beds? Do you have to meet all of her needs? Can you perhaps set some boundaries for yourself and take the focus off of her a bit? I'm sorry you're struggling. It will get better.
M: 43 H: 39 D: 14 Married 15 Together 16 BD: 6/2014 S: 8/2014 OW revealed 10/2014 Instigated dissolution 12/2014, in progress So over it!