rainonfriday thank you for saying so eloquently the very response that I wanted to give to @Choice4567! I really was struggling to find the right words to use, but you had already found them! So all I can really say again, is thank you so much, both for helping me out of my predicament, but much more importantly, for feeling and knowing, just how wrong Choice was with their unfair attitude.
@TheyDontKnowWhy you are going through such a horrendous time, and I feel for you so much, and can only agree with what the vast majority of the PP's have said. I wonder if you can access a therapist who can help you understand and see just how cruelly your ex treated you, and how you leaving was the only thing you could do for your sake, but even more importantly, for your DC sake. I know that it must be so hard for you to have your eldest DC seeming to take the side of your ex, but when they are old enough to know everything, they will hopefully understand more. I think that if you were to decide to return to your ex for the sake of your DC, you should firstly think about the guilt they may feel when they are older, for - in their mind - making you return to such an abusive and nasty life. I can only imagine that if you did return, the adverse reaction it might have on your other DC.
With your parents being so unhelpful (I am trying to be polite here), and all that you have suffered, and are continuing to suffer, I do hope that you will seek some help, whether that be privately, or through your GP. It may take some while to untangle all of your thoughts, and to be able to start thinking clearly again, but if you have someone to talk to who isn't invested in your situation, that will hopefully help a lot.
My ex left me many decades ago for a colleague at work, and one of our children was still a very young baby, but apart from finding out about his affair after our little girl was born, I thought we had an amazingly close relationship, so I was, of course, devastated when he left. If my GP hadn't arranged for me to see a counsellor, I'm not even sure that I would still be here today. So please ask for as much help as possible, because - especially without the support of your parents - you really need to have someone to listen to you, and to help guide you to understand that you made such an incredibly hard decision, but that it was the only one that was best for both you, and your DC.
Also, please come back here as much as you need or want to, because you, OP, are a great example of the reason why we have Mumsnet in the first place! I am so impressed by the stength you have already shown, and that makes me know that both you and your dear children will come successfully and happily through this. It would be brilliant if one day, I read on here, how in the end you are so proud of yourself for how well you managed the so difficult changes in yours, and your dear childrens' lives, and how happy and content you all are now! 🩷 xxx