How can I get over my office crush

I am attracted to a woman at work. She was initially into me she always brought me things, looked after me so much, gave me so many gifts at my birthday and made me teas/coffees.

Initially I was rude to her because my colleagues thought it was a bit off. Then I felt guilty and started being nice to her and now I look forward to seeing her every day.

I'm already married and she is getting married within days. Now she is leaving work and I am finding it emotionally very difficult to deal with. Please help