I hear you @Timetoheal4good . Have you heard of trauma bonding?
I found that learning why my husband behaved the way he did helped me heal a lot. In that it was him and not me. I was so glad he moved on to the other woman because his behaviour towards me made me hate him by the end but that was the thing - the cheating, above all of the abuse, some of which was horrendous - that hurt me the most. It's fucked up, but abuse is meant to fuck you up.
It takes a huge amount of willpower and self control not to contact them or listen to news about them. I was desperate for news, hopefully bad, but it didn't take me long to realise that any thought or knowledge of him, or her, made me feel worse. So cutting off ALL potential sources of information is the way forward.
There is absolutely no point in telling him how you feel or looking for answers because (a) abusers only feel pleasure at your pain and (b) you will not get the answers you deserve. He will lie, twist it, it'll be your fault, you'll be crazy - you'll have heard it all before. There is no closure with an abuser.
He might be treating her well just now, just like he did with you in the beginning. There will come a time, many times, when she'll realise that the dream she had of being you is a nightmare in reality.
I agree with PPs, fill your life with as much as you can, even if it's two trips to the bin instead of one, even if it's cleaning a window that you don't want to clean, even if it's painting nails you don't want to paint, do things that improve your life in whatever way. That cushion that annoyed him on the chair so it sits on the sofa - put it on the chair then bounce up and down on it. Fuck him and his cushion rules.
I totally get wanting to click your fingers and fast forward. You will get there, it does take time but that time is worth taking. You'll probably realise one day that you didn't even think about X event when normally you would have and the progress will keep on coming and you'll continue to feel lighter and more like yourself again. Keep talking, there are so many of us who have been there, who understand, we'll see you through, we've got you 