girl with boyfriend

I'm confused and don't know what to do. I have never been in a long term relationship. I talked to a girl that I like a lot at my college, I simply showed interest in knowing her and she immediately liked me, to be clear none of us told each other we love each other or how we feel to one...

so, this girl keeps talking to me a lot, she texts me everyday, she initiates the talks, she calls my phone (sometimes i also do it first but rarely). She calls me rude when i reply her late or don't pick up the phone, i do ignore her intentionally to make her go after me. But she has a...