How do I get over her?

We've broke up about a month ago because we couldn't work things out but a couple weeks ago she already is with another guy and I have to see her everyday for college and can't bring myself to really get over her. The days we dont have classes i feel like im doing fine but when I see her i feel like im at square one again. Is there anyway that I could overcome the gut wrenching feeling whenever I see them together?