Me and this girl called Sherridan, who's one of Charley's(my exgirlfriend's)(me and Charley are still bestfriends) friends keep having these really flirty fights and we have loads of fun and we've exchanged numbers and email addresses so we can contact each other outside of school. A few days before we exchange numbers and email addresses, Sherridan told me she had a boyfriend and up til now I've been okay with it and seen as we can't be boyfriend and girlfriend Sherridan pretends I'm her older brother and well I just go along with it. Yesterday, we'd I'd finished doing all the family and Christmas traditions and we just went back to carrying on as normal and I was watching Joey, the carryon of friends where Joey had an actual proper relationship with a girl but they were seeing other people as well and this made Joey jealous and now that's made me jealous of Sherridan and her boyfriend because me and her can flirt with each other but we can never be as close as her and her boyfriend and I want to be as close as them but I can't be.
What can I do?
By the way:
I'm 15
Sherridan's 12 going on 13 and my ex is that age as well.

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