well, two ways u can do it..
1) tell her abt it. no matter waz her reaction, at least u've told
her. so it kinda set ur heart at ease
2) harden ur heart. delete her no, email, contact...even if u've
memorised her number or email, restrain urself from contacting her.
let this jus be a memory ba. its not good to be a third party.
