Why is it a girl can barely say hello to me?

Like she knows me and she and I have spoken heaps before. Recently I noticed she can barely say hello to me. Like we walked past each other and she very faintly said hello to me. I've only ever been nice to her and shown I want to talk to her. She will have conversation with me but mainly when the 2 of us are alone. But then she can talk normally with other guys but not with me 😔

I did notice tonight she and I both made some eye contact before we spoke tonight. She and I looked right at each other as she walked past me.

Why is it a girl can barely say hello to me?
Post Opinion