#2 Issues with my past relationship.

I read multiple answers here in practo which helped me at least not to be desperate about my ex. I am more happy and do not break when I think about her. I even stalked her on social media and no love feelings came from my heart. It was just like okay she looks cute and yeah it would be fun if we were on good terms but nevermind, that's life and I would continue my daily routine. Though there is this guy who is flirting with her that annoyed me a little bit, made me feel insecure but I have to realise that she may not end up with me and will end up with someone so better realise it. The thing that upsets me the most is when she is with my friends and I don't like that because it makes me feel jealous that I can't have that with her and I have to see my friends have it. But I am living with it from the past year so yeah I am used to it. She is a girl and pretty so she gets all that attention but I don't have that social life. I would really like to engage myself more socially but cant