I’m going to go on a whim here and say you’ve never gotten any closure with this person or made peace with your separation. With children involved, I imagine it would be harder to created that distance/boundary that allows you to heal. I understand that it can be difficult, but you need to stopping putting any efforts into this guy any longer. Every time you have the urge to peek at what he’s up to through fake profiles, stop and channel that energy into something for yourself (i.e. read a book, do some writing, bake cookies, whatever it is you get enjoyment out of). It’s a great way to distract yourself and to uplift yourself. Some people find that a closure ceremony of some sort closes those doors. My girlfriends and I would go through this ritual where we would “cleanse” our homes of the guys that broke our hearts by gathering photos, letters, memorabilia, etc. and burn it all. It’s a painful process because it’s hard to let go of those memories and it’s difficult to not feel emotional over the loss, but once it’s gone, you have the opportunity for a fresh start with nothing holding you back. It’s actually quite liberating to get that closure because the pain flows through you, but once the emotions are through, you feel so much better.

Ultimately, you can do what you like, but consider this. By constantly looking into the life of your ex, you’re only hurting yourself. He’s clearly moved on and is living his own life. Find peace, let him go, and find your own happiness.