It's called 가벼운 사랑 (Gabyoun Sarang), from Fly to the Sky's 7th album, No Limitations.
It's translated as Light Love or Love Taken Lightly or Shallow Love. I'm not sure if I'm relating myself to this song. The situation might be different than this song though.
But I like the beats. =) and the freaking lyrics.
Here's the translation (credits to: Aheeyah)
I don’t remember talking about love or goodbyes
That moment of hesitation is time to forget about you
You pretend to be sad, to be hurt; don’t worry, I’ll let you go
You must have welcomed this goodbye
You loved me, but your love was too shallow
After letting you go I feel so weightless
My memories are right, you’re easily forgotten
I’ll find another you
My feelings for you have cooled
Step by step we separate, toward an easier love, an easy goodbye
Behind the back you’ve already turned
The change in your tone
The change in your gaze
Even your weak explanations; did you think I would excuse all that?
I thought you said I was too sensitive
You snubbed me with words like that
But today’s goodbye only causes me laughter
You loved me, but your love was too shallow
After letting you go I feel so weightless
My memories are right, you’re easily forgotten
I’ll find another you
My feelings for you have cooled
Step by step we separate, toward an easier love, an easy goodbye
Behind the back you’ve already turned
Isn’t this story over now?
Why? Why are you coming back now?
My time with you is weightless now and flies to the sky
Any other time was better; even now I regret it all
If you’re thinking of changing my mind please just go
Leave before you look cheaper
I regretted it as much as all the tears you’ve spilled here
As much as I loved you
My wounds lie deeper; your returning to me is a deeper betrayal of my broken heart
Feel the pain of a broken heart; I’m already sad so let me go
I’ve been hurt by love, so just leave me alone
You call from time to time
Asking if we can start over
Your restless love
Only invokes my pity; I only feel sorry for you
(My memories are right, you’re easily forgotten)
I’ll find another you
My feelings for you have cooled
Step by step we separate, toward an easier love, an easy goodbye
Behind the back you’ve already turned
Who would have thought, after more than a month, I'm only beginning to crumble now.
Oh shucks. I wanna get over this.