Help dealing with NC, divorce and coparenting

Hello. I was married to NC (and borderline personality disorder) for 17 years.
I finally couldn't take the madness any longer. Realized it was effecting our children and my teen son is very aware of NC issues. I started seeing a psychologist last summer and knew it was my only option to leave him.
He constantly tries to contact using the children as a reason. And texting is non stop. He still will try anything to manipulate me into having conversations, arguments with him.
And he believes we should have a open communication relationship. I know that's not healthy because he has no boundaries and will tell me things about his personal life. I know it's a ploy to get a reaction out of me. I've been doing good to not react and only communicate about our children.
We separated last November and the divorce was just finalized this March.
I refuse to communicate through texting because it results in constant communication and he non stop will go on and on. Bully, belittle me.
This has angered him I will not respond.
Unfortunatly I do have to have some communication with him about the boys.
And see him at my sons baseball, or kids events. He's hinted that he has a girlfriend already.
While I'm glad to get rid of him and no way want him back. I'm not ready to deal with all these issues. I know he can't be alone. I've read many books to remind me of how NC are and reminder of my life with him.
How do I deal with all of this and still coparent? And I know the kids and I aren't ready to deal with another woman in the picture. Why do I still feel jealous? I feel sorry for anyone that will be caught in his web, know are relationship was unhealthy and he will never change. So why does this emotion creep up? I have enough control to not contact him.
Any advice on how to deal with NC and divorce, coparent would be great.
Plus he is now trying to manipulate the kids. Acting out on them. Luckily my teen sees right through him. But still sad.
NC has tried to manipulate me into believing there are no good men out there and no man could deal with me. That most woman married to executives would see past his NC ways , yes he admits he is NC. In his eyes you have to be to climb ahead in business.
He also told my younger son that any man I date will ruin the family and do bad things to him.
And knowing I have to go to college and get a decree so I can support myself and boys, he told my son that any babysitter or aftercare are all child molesters.
He's making my life hell even after the divorce.