Jealous of ex-gf's friend. Advice please

I know it’s not my place anymore but I still feel jealous when I see my ex-girlfriend interacting with this specific friend she has in social media. When we were still together, she would barely post anything about me and us. She didn’t even post about our Ukraine ski trip saying she just wants to keep things private. Now she’s posting screenshot of their conversations, video of her cheering for her friend during this marathon they joined.

Said friend also posted a screenshot of my ex-girlfriend’s motivational messages during the run. A part of me is jealous that the friend can spend time with her than me but another part of me is jealous of them in general. Like wow she’s posting things now when she kind of hid us before?! I really hate the feeling. Is she doing this on purpose to make me feel jealous? Does she really hate me that much? Advice please