Most Helpful Girl
If you want her back I wouldn't unfriend her. If an ex unfriended me, I would take that as them moving on, or that they dislike me. However if she doesn't give any indication that she still likes you, you should block her. Just so you don't have to see her and be reminded of her. You shouldn't suffer for a girl that's moved on already
Most Helpful Guy
unfriend her and live your life, painful memories is just a waste of happier. let it behind and forget about her.