I freaking love this song, Hope to see your interpretation on it.
it captures the thoughts of a person who's defeated from love, you know, when two people have been in love and one of them gets out of it and moves on, it sucks for the other person to be in love with him still, knowing that he doesn't love her anymore. it's a form of most unbearable pain. to still be in love while the one you loved has moved on with his/her life.
some people go thru this pain and wish the other person will get to go thru the same while some other people wish the person they love, will never know what it feels like to be hurt that way

I think that's why this song is so beautiful. in this song, this person, while going thru hell, wishes that the other person will never ache like she does. so in that way, she has actually won in her love, not defeated. may this song be a guiding star to all the people who's hurt in the name of love.
besides, this song has one of the best line's ever in sinhala songs
"ahimi wijithayen, samugena yannam, obata so thewul noma wewa" - this line showcases the entire song nicely.