How can get someone you loved out of your mind?

I've been in a similar situation, I once fell in love with someone who can never be mine. Actually both of us are in the same situation, he was also inlove with me but it's not possible for us to be together. We were officemates so it was kind of hard to avoid each other. There was a point when we both decided to stop ourselves from being attached to one another, as our work was already affected and gossips were already causing tension in the office. At first, it will be very hard for you but believe me there will come a time that you will eventually stop thinking of her. Just do the first step, stop seeing the person and make yourself busy. Luckily for me he was transferred to another office so gradually I learned to stop thinking of him. I don't know the exact situation you're in, but for me determination was needed to finally stop thinking of him. He was married so it's best for us to forget each other.

Try do a lot of activity so you can don't have time to think of her. Or maybe you can hang out with you friends. Don't try to forget her just let her be one of your past. You can't feel what falling in love is if you never broken heart. Maybe time can heal your pain.