Off and on "friend"

Don't think it's normal but curious on thoughts.
I got this person who was hella awkward wouldn't talk for a while no eye contact so I waited. Eventually we talked yet I see them talking to new people fine. We hit it off well because we both have the same humor and like to joke and laugh. We seemed to have gotten kind of close for a short period of time but then it's like she pulls away. I don't know why but she will ignore me when I try and talk. Or give me a dirty look if I look at her. Yet watches me like a hawk especially if other people talk to me.

It's very off and on and I find it immature but I often wonder if it's something I did or just a toxic person. I miss the good moments but I'm not in for mind games. I've just kind of ignored back but I wonder if it's some sort of trauma bond of some sort. I feel I didn't change myself but that she went off and on for whatever reason. Kinda sucks but anyway anyone know anyone like this and maybe why it's happening? Both girls just curious on insite as is I've just been avoiding back.