Relationships

How do I (26M) stay friends with my ex girlfriend (26F)?

My ex and I started off as friends with benefits than became best friends then finally got into a relationship. Through our friendship I always had feelings that she knew of but she never felt the same way until I started dating other people, then she realized that she was in love with me. We broke up about 5 months ago. It wasn’t a bad break up, it was very cordial. She suggested we stay friends like how we used to be. We text and see each other often, which leads to us hooking up and cuddling throughout the night. We don’t kiss at all tho. We both have seen other people during this “friendship”, she acts nonchalant about it but always expresses that she’ll hate my future girlfriend and to be honest I feel the same way. She also shared that she doesn’t want to know about my dating life.. She says she loves me but she’s not in love with me and doesn’t see us getting back together in the near future. I’m totally still in love with her and I would take her back in a heart beat. I find my self being super jealous when she’s with other people and honestly super sad that she doesn’t want to give it another shot especially since these last 5 months have been free of drama and we are actually working very well with one another. She said if I was emotionally mature I would be handle a friendship with her but I honestly do struggle with this. It brings a pit to my stomach thinking that I have watch her fall in love with someone else. How can I become more emotionally mature? She’s my best friend and I don’t want to lose her. TL;DR ex and I are trying to be friends, how do I become emotionally mature enough ti handle this without my feelings towards her getting in the way.
How do I (26M) stay friends with my ex girlfriend (26F)?
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