How to get rid of emotions for her for good?

There is a girl who rejected me. She liked me at one point, we went out and we kissed few times. Then she rejected and i dont know why. It has been two years and i dont know if i have moved on. We live in a small town and have mutual friends so we usually see each other often. Now i dont think about her that much and i see her flaws now that i didn't see back then. Lately i dont go that much out cuz two of my closest friend got into relationship and in summer and September i was always out so i got a little tired of it. Since semptember i saw her like three times and when i go like three weeks without seeing her and talking to her i forget about her, dont think of her and basically just dont care about her and kind of feel nothing. But sometimes when i see her and we talk and she smiles and stuff i get sad and wish things would be different. How to stop this?

How to get rid of emotions for her for good?
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