I think there is something wrong with me mentally. What should I do?

Im still obsessed with my ex from over two years and he's told me to get out of his life but I still text him and he tells me to leave him alone. I spend all day thinking about him, sometimes I even dream about him. I create fake profiles so I can follow him and his friends to see what he's doing and I send him fake text messages. I know this is all crazy but I can't seem to stop. Can someone give me some advice?
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I've also found that I spend a lot of time trying to go places where he will be. I waste so much time on him and I want to move on but don't know how. I feel like since I handled it wrong in the first place I will never get over it and will always feel this way
I think there is something wrong with me mentally. What should I do?
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