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What has helped me, (it has in no way erased him from my mind, but it has helped) has been to delete any social media that gives me access to him. Maybe not permanently, but to give yourself a break from the temptation of checking in on him. I removed the Facebook app from my phone so he isn't one click away, and though he's still on my mind, it prevents me from seeing his posts and reading too much into them. I'm not sure if that'll help in your situation, but it put my mind at ease a little.