She said yes to coffee, but I think she has a boyfriend. Why?

stupidguy
I really like a girl at my university, but we don't know each other at all - other than she has seen me speak about psychology and I have seen her speak about psychology (in the class, one student teaches the first hour of every lecture)..

so we both have an impression of one another - and I like what she had to say, or at least how she said it..

any way, today was the last day of class, so after I waited in the hall. she walked right by me and went to the elevator, - so I pretended I was taking the elevator too. we started talking, and I soon I was getting out on her floor. we continued the conversation and everything felt really natural -neither of us were searching for things to say, we were just walking and talking as if we had known each other for a long time.

any way, we arrived to the lab she was going and it was obvious that I had gone out of my way, so rather than making up an exuse for why I was there - I asked her if she would like to have coffeee sometime. she said yes before I finished studdering out the words and wrote her name and number on my hand even though she had paper.. and then invited me to a holoween party tomorrow night..

any way, I was sure she was interested at that point, and was really exited to see her again until I found her on facebook and saw that she 'is in a relationship'

so, as always, I am confused about a woman... but I don't even know if he lives here.. we are in amsterdam and both of us are new to the city, so maybe he is in another country.. I don't know. but I know that I really like her, and that never happens to me.

so I guess what I want to know is, when a guy and a girl don't know each other, and he asks her to have coffee - she knows it is supposed to be a date right? and she wouldn't give him her number and invite him to a party without ever considering that he likes her would she? it's impossible isn't it?
She said yes to coffee, but I think she has a boyfriend. Why?
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