Unfriending sounds upsetting. But I really don’t understand needing to wish happy birthday on Facebook. You can call or text or email or visit or take him out. I don’t understand why happy birthday must be on Facebook? Are you upset that others would notice you didn’t wish him happy birthday or upset you cannot wish it (which is easy to fix outside of Facebook). I just don’t grasp the Facebook issue. Now if he refuses to talk to you in real life, then it’s truly is upsetting.