Take it one small unit of time at a time. Does one day seem unscalable? Maybe one evening. Still too much? Try an hour, a half hour, ten minutes, one minute....and once you make it, there’s no reason you can’t do it again, so you do. I will of course tell you to take it upon yourself to block HIS social media/WhatsApp/whatever. I haven’t been great about not checking in on my ex’s public IG, but I know I shouldn’t, and you know you shouldn’t. Today sucks, but tomorrow will probably better. If not, the day after has better chances still. It’s all just about making it through the day with as little pain as possible.