Yeah, i was thinking this was the only way, to ignore her continuously. But it looks like she's quite stubborn. My guy friend tells me this has been going on for months (3,4 or 5??) and she's quite... um... well- she's not a very nice person (i found out she's quite stubborn, arrogant, spoiled, selfish etc). *sigh*
But thanks for your help SeptemberMorn.
You see, we are currently studying in University. My guy friend has 3 more years to fully graduate from University and this means 3 years of torture for him. 0_0
The thing is, this 'ex' has also been affecting his studies really badly (if you still need more details, i've also replied in the 'self-injury' section).

"Cherish your happy moments, for they make a fine cushion at old age..."