From the album Alternate Ending - Single
This is about someone who has gotten so good at mentally rewriting the breakup that they no longer know if they are actually healing or just performing recovery. The obsessive reversal fantasies (pulling goodbye back, painting light back in eyes) are not nostalgia. They are a coping mechanism that has become its own problem.
Pull goodbye back in my mouth, put the rain back in the clouds / Burn the thought of leaving town in the ashtray
These are not memories. They are undo commands, mental Ctrl+Z on every moment that led to the end. The specificity (mouth, clouds, ashtray) makes the fantasy feel almost physical, like if she imagines it hard enough it could actually reverse.
I don't know if I'm good or just good at pretending
This is the whole song in one line. She has performed moving on so convincingly that she cannot tell if the performance has become real or if she is still faking. The ambiguity is not poetic. It is genuinely unresolved in her own mind.
Fade the real into the fiction, swear the heart don't know the difference / Gave it to you and I didn't want it back
She admits the alternate endings are fiction but insists her heart cannot tell. Then immediately contradicts herself by claiming she did not want her heart back, which the entire song proves is a lie. She is lying to herself mid-verse and does not seem to notice.
Some nights, I lay awake and I try to fake / Being happy that you're happy now
Notice she is faking being happy about the ex being happy. Not actually happy. Just trying to perform the selfless ex-girlfriend role convincingly enough to believe it herself. The missing-you feeling keeps returning because she never actually let herself miss him honestly in the first place.
I don't know if I'm good / I hope that you're good / I've gotten pretty good at pretending
The song ends without resolution. She still does not know if she is okay. The only thing she knows for certain is that she has mastered the performance. That might be the saddest line in the song.
The tragedy is not that she is pretending to be over him. The tragedy is that she has gotten so good at it she cannot access her actual feelings anymore. By the outro, the only certainty she has is her skill at performance. She might never know if she actually healed or just convinced herself she did.