If i do this , will it be considered cruel? 10 pts for best answer?

[shawn]

so there's this girl in one of my classes at university that always chooses to sit right next to me and she kept looking at me so I approached her and started small talk. She gave me her # and told me that I should help her with the class and that she would repay me in coffee or energy drinks cause she noticed I drank that a lot everyday. and when I asked her why she would need my help she said that I seemed intelligent in class and that seniors should help underclassmen. (I found out on faceboook that she has a long distance bf however in the military)

fast forward a few days so . I asked her if she wanted to grab lunch or something and she said she always meets up with her brother for lunch and I was like ok fine, wanna hit up the rec later and she said she had to do something with her best friend.

I told her I had a strong distaste for people that acted like that and left it at that. I already deleted her number and am planning on deleting her on fb as well and not even acknowledging her in class. will that be cruel?