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I'll get da f*ck out of your life, have a nice life b*tch?

I am going to out of your sight, you be happy.

This expression is a little cynical.

"I agree that we don't love each other, so I am leaving now.

I think you can live a better life without me because you don't love me any more."

Maybe his/her partner did break his/her heart...

I don't know it...

But it's G.NA's song

So I youtubed

And got "I'll Back Off So You Can Live Better"