<human>: We basically grew up together, and started dating when we were 15. He was the first person I have ever truly loved, and our relationship was amazing and mature. We broke up almost a year ago because we simply realized that we were gradually falling out of love. There was no drama (although we were both sad) and we decided to stay friends. The problem is: I am perfectly fine with the idea of him dating another girl, but as soon as he actually starts seeing someone I get absurdly jealous. I am sure that I'm not in love with him anymore and I don't want to get back together, but I can't help feeling like he's mine, and thinking that no girl will ever love him like I did.
We went trough so many things that I can't stand the idea of not having him in my life, he still is one of the few people I can trust, and he knows me more than I know myself. I feel selfish and stupid, but I am scared that he will forget how special our relationship was, and I am scared of seeing him happy. I feel horrible, I know I should want his happiness but I can't help but being jealous.
What should I do?

Can you give me a shortened version of the text?
<bot>: I'm still friends with my ex boyfriend, and he is one of the most important people in my life. I can't help but being irrationaly jealous of him, even if I'm not in love with him anymore.