Why is my friend unable to support me but has no problem supporting my other friend?

I’m in this friendship group it’s me and this other girl. I have noticed that of the girls in the friendship group always likes and supports my other friends posts, but she never ever likes anything I post. I see that she is always active and online and she is always reacting to the other girls post with a love heart but she ignores mine. I know she sees mine too because she views all my stories I post. She also makes comments about what I post in person like “I keep seeing you going out on nights out and I don’t know how you manage to do that and function at work the next day. She will always view my stories and in person she will mention what I’ve posted. If I’ve posted about a new job offer she will tell me “i saw you got that new job” but she never liked my posts. When I post photos after a night out she never likes them and says in person “I couldn’t do that and go out all night and get up the next day for work” except the other girl in the friendship group posts night out photos and she has no issue liking her photos and supporting her, and commenting nice things on her photos. When I meet up with both girls the girl who never supports me makes comments that we never speak or arrange to meet up, but in the past I have tried making effort with her to meet but she always refuses and then ends up meeting up with the other girl in secret.

I see that she supports the other girl in the friendship group all the time and will like all her posts and comment things like “gorgeous girl” but completely ignores mine. Sometimes when we meet up in the friendship group she will make indirect comments like “we’d all like to have a camera like yours and take professional pictures” and looked at the other girl and smirked

I can tell she’s mad insecure too because she will post photos of herself on the group chat and ask for us to compliment her

What is her issue? Why can’t she ever support me?

Why is my friend unable to support me but has no problem supporting my other friend?
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