This girl was new in campus, nobody was talking to her in my class, so i took advantage and started talking to her . We vibed very well the first 2-3 weeks but then she started to change, she started to act a little bit weird, for example: she gave me cold answers, she acted disinterested, its seem that she was mad at me. So my question here is: What did i do wrong?

I assume she changed because i was too boring or something like that.