This is such a difficult and messy process man. I feel your pain.
You didn't backslide on detachment - it will be a tug of war for a while. Detachment will take some time and you will slowly peel off some layers. These moments actually are important for detachment because you are allowing yourself to feel and process your emotions. It is a good thing.
Don't be so hard on yourself. Sometimes detachment sounds like you need to turn into a cold hearted person and everything that comes your way, you just dust it off. That's not what I think it is at all - and I don't think you're thinking of it that way, i am just saying what it can sound like.
This is where GAL has been so helpful for me. I know it's not a magic formula, but the more inwards I went towards myself, the better I became at managing my thoughts about W and MR and the rest of it.
I hope you can do something this weekend just for yourself - drinking is great, but it just numbs the pain right. Don't get me wrong, I did that, but I realized it wasn't helping me become better and not a good coping method.
Don't be so hard on yourself. You're not going to be a lean mean detaching machine instantly. Give yourself time. Most importantly, allow yourself to forgive yourself and be kind and merciful to yourself. I know that once I allowed that for me, it lifted a huge burden off my shoulders.
