I find memory can be a beautiful thing yet a curse. It holds precious things from your past, victories, happiness, etc. But it can also hold your failures and things that have hurt you. Keep the good memories close and forget the bad ones.
No one knows your full story. No one knows the feelings you felt on those days. If you could read my mind, you would be in tears. Take the time to talk to the shy person in your life, they may be hurting more than you think.
"I think part of the reason why we hold on to something so tight is because we fear something so great won't happen twice." Sad thing is that holding on will also keep a greater thing from coming. Fear should never be a motivation.