What is wrong here?

[Robertwalkerr]

There's a girl who loved me since we are kids, she tried a lot but I was kinda in relationship and she was younger, from like 7 years ago there is some problems happens and we didn't see each other anymore, we just talked last months and I likes her and there is many things she do tells it's mutual, but she's really silent she is not starting any conversations, she didn't tell me happy birthday? I'm sure it's still mutual but I can't understand her attitude.

[Guy13]

Forgot your birthday, by chance?

[Robertwalkerr]

No, I'm sure when I posted new photo she had a notification and become online, she kept watching in silent.
She engage with her 2 male friends, but she is silent with me.

[Guy13]

No idea to me except "on the back burner or friendzone"