New Life

Hi All,
Coming back here after a while. After my last post, there has been a number of changes in my life.
For one, my divorce has been finalized. I was so looking forward to the process to get over. I think it was essential for the closure. Weirdly enough, my ex husband has been trying to keep in touch, come & meet me every now and then and seems to be trying to find out what is going on in my life, who I am hanging out with etc. I am not sure why and I often wonder what is it that he wants. Has anyone faced a situation like that or have thoughts on the why behind it?
I do definitely know that I have no interest anymore in going back after the way he treated me towards the end . I do not wish to keep this "friendship" going and would just like to carry on with our separate lives. But I do not know how to put a stop to it. Any suggestions?
P.S. If you need background on what happened, how he treated me etc. I posted about it previously:
Reckless words pierce like a sword
What brings me here...

Secondly, I am in a new relationship with a great guy. He knows about my divorce in detail. But he tends to be a bit possessive (I believe because of his past relationships and the betrayals he received). He does not seem to like the fact that my ex husband is still trying to remain friends with me or comes to meet me (once in 2-3 months), understandably so. I definitely do not want my ex & his wish to hold on to the friendship to create problems in my new relationship.

Would appreciate any advice that you can offer.

Love,
Sushi