I can't stop stalking my ex on whatsapp. What should I do?

I know I should delete his number but I know it by heart and can't help but check if he's online and when. I know it's wrong but I can't help it. And it breaks my heart because when we were still together, he would always cut me off early in the evening cause he 'was going to bed' and now I'm seing him online at 2 or 3 am. It's killing me. What should I do? Will this desperation of knowing what he's doing go away? Is it normal?
I can't stop stalking my ex on whatsapp. What should I do?
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