Search Results: get a girl to stop playing hard to get

I'm new to the dating world and I'm still learning about body language. Please help me, I'm curious. These are all from my high school.

Girl #1 -
1.) Everytime we pass by each other, she keeps eye contact. When she gets close she smiles and says hi.
2.) Called me tall and "nice". But this was after I told her that she had a nice voice.
3.) I accidentally ignored her when she said hi. When we pass by each other, I catch her looking at me but she instantly looks somewhere else.
4.) One time she was with one of her friends. Her friend said hi to me, so I said hi back. The girl said hi and instantly looked somwhere else

Girl #2 -
1.) Everytime we pass by, she stares at me for 3+ seconds
2.) She tries to start conversations, which I kept ignoring / acted disinterested
3.) I'm confused because this girl is around 9/10. Definitely above an 8. I'm a Korean guy, I don't look like a model, but I consider myself pretty attractive, much more attractive than an average Asian guy. However, I felt like this girl was just playing mind games with me for an ego boost because I played hard to get earlier. One time when we were passing by, I gave her a strong "glare" for a good couple seconds and looked away. I was trying to send the message, "why do you keep checking me out? I know you're probably not into me. Stop stringing me along for self esteem". Ever since that happened, she looks at me, then looks away nervously.

I don't know if these girls want me to approach or not. I hear girls saying, "why isn't he getting the signals" all the time, so I don't want to miss the signals. But maybe I'm reading into the signals too much?

Also, what does it mean when a girl that I haven't talked to for a long time stares at me, grins, and smiles?
When a girl that you never talked to approaches you holding eye contact, and hits your arm "accidentally", does she want you to approach?

Immature comments will be ignored. Thanks