Im a man, and I wanted to give you some perspective from a mans side. Its not easy at all and whilst everyone is different, going no contact after a breakup is all about setting boundaries.
Having been dumped by someone I loved deeply, then going no contact - its incredibly hard, and neccessary to move on. Staying connected as "friends" only delays the actual moving on part, seeing each other on social media and the potential for seeing one of you with someone else is just a way of giving yourself emotional whiplash.
If I saw my ex on social media with someone else, and I still had feelings, it would be extremely painful.
Men aren't some cold, heartless machine that moves on and forgets - I can guarantee it will be painful, even if he doesnt show it. And in my opinion, chasing is a fools game and doesnt work. If someone wants to be with you, they will be with you, if they dont, best to cut ties, and actually move forward with your own life.
It sounds harsh, but its the only way to stop yourself from being hurt over and over - we are all only human.