We dated for two years and broke up two years ago. I have not been able to stop thinking about him for the last couple of years, it comes and goes in waves of missing him and thinking of him. He messaged me probably 30 times after we broke up, begging for me to just talk to him - he knew he wouldn't get anything out of it. Thing is we broke up for a good reason, he was emotionally abusive and betrayed me with cheated and drugs/drinking, so I would NEVER date him again. BUT I do care about him always and think about him all the time, so would it hurt to add him on facebook and just ask how he's been or something? I don't have the intention of dating him at all.