How to get over a girl?

Basically I asked this girl out after getting good signals and then I found out she was a damaged type of girl and she wasn't into dating. Don't know if it was true or not. I got really close to her and for the past couple of months we've been talking a lot. Now, on my birthday she tells me she's seeing someone and that was rough because I bought her an expensive present for her birthday. I told her a day after we could be friends but I haven't texted her since Monday and i'm trying to move on from her. I got rid of her number from my phone and online. And I gave it to my friend and I told her that don't give it to me unless it is important like for school purposes since we are in the same online class. Now I keep thinking about her and I haven't talked to her in 3 days. How does it get easier?
How to get over a girl?
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