Most Helpful Guy
As someone who's dealt with that more than once, the only thing u can do is give them space and time. Forcing yourself into their life when they don't want you in it will only make things worse. If they unblock you through social media or their phone, you can consider taking a chance with apologizing. When the girl unblocked me I sent them a message apologizing. But I left it up to them to contact me back afterwards. One girl responded back, the other one I haven't heard from in years. It's up to the person to decide.
Most Helpful Girl
If you think they still having feeling and you have feelings for them I would. if that person means a lot in ur life I would. if you were unblocked ftom Facebook means you are allowed in their life again.