I have an addiction

I need to admit it, I keep stalking my ex on social media. I'm so hurt from everything he put me through, here's a PART of the story; he left me for someone he just met. Now he goes on and on about he's happier with her and has never felt so in love before (it's been a month) i can't seem to move on even though he already has. I want to stop checking up on him but it's so hard to. ADVICE PLEASE! I'm tired of feeling so depressed over this.