Is it normal that i got rejected bcoz she only wanted to date in the internet

Well, You know, when i was in Senior High School, i moved to another SHS. and then meet a girl.

at 1st, i don't pay any attention to her at all. but, she started to ask for my help and she even gave me her number that no one have ever got it before. she trust no one but me, and she's counting on me so much. that's makes me a little happy.

and at some moment, when i was in a random robotic competition, she and i met by a chance in a bookstore. and she asked me whether i was hungry and gave me a chocolate. i was with my friends at that day and when they see this, they started to tease me says : "Hey bro, that is an expensive chocolate! you must repay her with something other than money!" when i think it's a joke, i said "well, i will repay her by my love." and then, when i saw her face, i see her face is as red as tomatoes. that's when i started to like her.

and some event started and that's motivated me to ask her on a date. but when i finally ask her, she said that "I'm sorry, i can't. i just don't want to be a girlfriend of anyone in the real world. i just like to be a grilfriend in the internet. sorry."

and then she proved it by she got her boyfriend on facebook. and they are seems pretty close. and that makes me a little jealous.

it is confuse me so much. well, FYI, in my country, we don't do sex before we are marriage. and she isn't the type that loves to have cam sex. and she doesn't even know what it is.

but is it normal for her to do that?