Bad feeling. She is just in my office.

Couple of months back, my cousin decided to get arrange marriage to a beautiful girl who works in same big MNC where I work. Girl don't know that i am  a cousin of her fiance and she just never noticed me but i used to notice her every time she pass by me and feel very good and happy. Before 10 days of marriage they decided to quit due to couple of personal reasons. After hearing that i felt bad and cried sometimes as well.It's been 40-50 days and i always search that girl in office and when ever she is around me and feel not good, tears comes on eyes but i just control myself of being crying publicly. Most of times i think of all this and does concentrate on anything, started spending time alone, with less talk in office as well.Not sure why i have changed all of sudden.though my role was very limited in all this except she is just in my office.