It’ll always be your fault, in his eyes and in yours, that’s how they work.
don’t rush into anything. Just look after yourself first and foremost. Get your hair done and take some time to look after yourself, you’ll feel stupid doing it, but I’m onto week three of my husband (partner of 18 years - I’m only 35) and I’m telling you that you can already begin to feel better.
get a journal app, every time you feel overwhelmed or like you will message him, write in the journal as though you are writing to him. Some times you will be angry, other times sad, but you can say whatever you want in it without repercussion. It will help you straighten things out in your head.
forget about the OW (if there is one) because it’s irrelevant. The only thing that matters right now is that you look after yourself and that you start the grieving process. Grieve for the future you’ve lost, that’s ok, but remember that it doesn’t mean you have no future, it’s just different.
make a short list, just a couple of tasks you need to complete that day. Even if it is as simple as washing your hair, or popping out for bread. Cross them out as you complete them.
there is no easy fix, and I realise I am a bit odd for being in such a good position after such a short time, but, I promise these tips will help. And in no time at all you will realise that actually the relationship you are mourning isn’t the best thing about you, and you are the best thing about you.
you will get through this