Hi WhatNext,
I'm really sorry, I've not had the chance to read more than the first few posts on here and the last ones - DH has taken DS out for an hour so I'm here on a run!
First of all, the one thing you must not do is let this man and his OW pull you down. He and she are in the wrong, not you. As for the OW looking like a model, so what? As many people have said, everyone puts their best photos on FB and anyway what have looks got to do with it? My exH was a nice looking man, until he held me by the neck against a wall and punched me in the stomach. My DH now is a nice looking man - he's never so much as punched the table in anger. Looks mean nothing. And you say she's more cultured than you. Does that mean she enjoys certain books, certain music? So what? I mix with people who enjoy the things I enjoy and if that's not cultured why should I care? I enjoy it and it hurts no-one so it's good.
My ex was like yours. His leaving was 'my fault', his violence was 'my fault'. I remarried a number of years ago but I still get the odd text from my ex - who is also remarried - mentioning how much he misses me (bet his current wife just loves that!) I could change my mobile number but my friends know it and I refuse to be dictated to by my ex. So I show DH the texts (I am not going to lie to him, he deserves that respect) and then I delete the message. I never reply, I am not interested. I don't even send a 'don't contact me' text. I refuse to get into a conversation with my ex.
You're in a slightly different position. You've still got to move on. But you will. I was walking in your shoes a few years ago. After a few months I suddenly realised that I could let the b@stard grind me down or I could leave him far, far behind and enjoy my new life. A year later I met my now DH, we married a year after that and our DS arrived three years after. I thought my world ended when my exH walked out. I now realise my world actually just changed and the one that opened up was, eventually, so much better.
You mentioned that you haven't felt like putting on make up etc for weeks. Do me a favour - tomorrow, sit down with a cuppa, put on your favourite music or find something you enjoy on the TV and pop some make up on. Just some lippy or a touch of mascara, whatever you normally wear. Brush your hair. Now look in the mirror and hold up your head. That's what he's missing and he's an idiot. And the OW has anchored herself to a man who will walk out for the next best thing if one part of her looks change. They suit each other.
You will feel better. It will take time. You will move on. It will take time. But one day you'll get a text from you exH and, like me, you'll delete it and get on with your day without a backward glance. Then you will know you have risen higher than he and the OW will ever do. Truly.