OP, you've done amazingly well separating from him. Really well done. That's so hard to do, and it's a great, great step. I have an image of you just two steps after a cross roads. The path you are on is towards freedom. Your children having a happy mum, and seeing a good example of how to take care of yourself.... and if/when you want it, you having a loving relationship, with someone who treats you well, who you feel your best, happiest self with, and who totally respects it when you don't want sex. No pressure, no guilt, no nagging.
The other direction is with a man who has shown who he is. Yes, sometimes he acts nice. He says he loves you. But you KNOW he is capable of riding roughshod over what you feel. You KNOW he is capable of having sex with you when he really knows you are not enjoying it and don't want it (yes, raping you). You also know that you have told him numerous times what you need, that he has promised to change, then failed to. He has told you quite clearly that he doesn't give you what you need, because the rewards for him don't come fast enough (ie he has no motivation to give you what you need to help you be happy - just in order to get what he wants from you). The character of the man you are describing won't change. So you really do know what's down that path.... and you know it's miserable.
But I get it. It feels like a known misery at least.
The fresh path you are on feels unknown, with no guarantees. And that's pretty scary. It's really really understandable to be scared.
But you've asked a few times, can it really be better on this new path, and the answer is yes,
You have got so used to this man's behaviour, that you are not sure there is better out there. And of course he has tried to convince you that there is worse out there, because he wants you to be scared and step backwards into the other path.
But there really is much better out there on this new path. First off, being single is better. You are free of that weight, that worry. You are no longer around somebody who is eroding your self worth and violating your boundaries. You have time to heal and refind yourself.
Then if you become involved with another man, you can expect far better than your past experience. Yes, good men are out there. My DP has a very high sex drive. But he wouldn't dream of pressuring me into sex if I'm not in the mood. It's been several months now, I've been wanting far less sex than usual, for various reasons. When I asked him how he was doing, he simply said "Don't worry my love, I've got hands." In fact, I can't even tell if he wants it and is frustrated at all because he leaves me in such peace. When I asked him about it, he just explained "my love- I know you're dealing with so much and your emotional well-being is all that matters to me. When I know you're not 100% sexually excited, I become incapable of wanting it too - it's like a switch that goes off for me. There is no problem here for you to worry about".
I'm telling you this in some detail because I think you have understandably lost a sense of what normal should look like. My DP is no kind of hero. I don't need to feel grateful to him. He simply understands, like normal, healthy men who love their partners, that he isn't owed sexual satisfaction. He is incapable of pushing sex on me when he knows I don't want it. And he cares more about my personhood than he does about getting his sexual desires met. These are basics for decent men. And there are lots of decent men out there.
You are having a wobble today.
That's natural.
But you are on the right path already, OP. Just pause, breathe, and when you are ready, keep taking more steps. 