Brushed her breast against my arm?

Ive known this chick for years now (we around 18 -19), we never been close just casual talk anyway that was years ago now she is taken, but she still makes daily eye contact with me sometimes its awkward or whatever and her boyfriend used to give me dirty looks (Idk why). But today in class I was going to my seat and she got up and the place is pretty tight but not that much to have physical contact, then when I let her go first by me she completly brushed her big boobs against my arm I felt everything, even the line that separates both breast lol

Wats up? she is taken lol
Brushed her breast against my arm?
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