I'm Through with Me

 is a song from the episode Split Personality where the Busting Candace and the Romantic Candace starts to sing in the Googolplex Mall.

Lyrics
Candace: Me, myself and I

Don't see eye to eye

Me, myself and I

Don't get along

Me, myself and I

Can finally say goodbye

This collaboration always felt so wrong

There's two of us on the scene

And I don't want to sound mean

But I'll tell you that I'm happy without me

I've been holding me back

But now I'm on my own track

We're done. Finito, I'm free

Romance Candace: From here on out

We can both exist peacefully

Without all of this struggle and internal strife

Busting Candace: (Internal strife)

Romance Candace: Now that we're separate, we can do anything

So don't let the door hit you

Have a nice life

Busting Candace: (Have a nice life)

Busting Candace: I'm through with myself

I'm better off without her

Romance Candace: (Myself and I)

Busting Candace: I'm through with myself

I'm better off without her

Me, myself and I

Don't get along

Romance Candace: (Without her)

Background information

 * Besides being a common phrase, "Me, Myself, and I" is also the inscription on a poster Candace has hanging on her wall.
 * The way Candace is singing, and the fact there are two of her, are reminiscent of "Busted".

Continuity
The shop that the Romantic Candace enters during the song is Retro Pharmacist Limited, which was made popular during an outbreak of Doofenshmirtz clones that changed the style from Summer All The Time Collection to Retro Pharmacist ("Run Away Runway", "Finding Mary McGuffin").