How long does it take to get over a Situationship that was for a year and a half?

I was in one for a year and a half, I ended it because he refused to end it, if I didn’t end it he NEVER would have. It would have just kept going for years. He said he never wanted to stop seeing me. It ended around 3 weeks, and I still think about him every day and I miss him and I cry for him. I just want to stop caring and stop thinking and missing him. I don't know what to do…
How long does it take to get over a Situationship that was for a year and a half?
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