How do i stop stalking him?

[Bing!]

I need to stop cyber stalking this guy i had a thing with a few months ago. It didn't work out between us and clearly i'm the one suffering now because i liked him a lot but he was a jerk. Now the trouble is even though i have deactivated my Facebook and i have blocked him on instagram, i still find myself checking his pages constantly even though it has been almost 3 months since we broke up. It's very easy to stalk him since his accounts are public. I don't know how to stop this. i know i gain absolutely nothing out of it, i only put myself in a bad mood and i know we will never be together again, so what should i do? Any tips to help me stop this behaviour? Please no silly answers, i'm hurting and i need some good advice! And no i cannot delete my instagram account because it's my only way of keeping in contact with some friends, and no i can't stop using the internet because i need it for my studies. Any other suggestions are welcome!