There are two melting points.
One is when he is singing for Jane My Funny Valentine
Chet:
My funny valentine my dear Jane,
you are my fun,
and my valentine.
All the love letters are in this song ,
and are also in my eyes.
The air conveys my love to you,
as long as you can breathe,
as long as your eyes can see,
all this gives me to thy.
One is when Jane knew the relapse after seeing his touch of face. Disappointment writes on her face.
Jane:
It's him.
My love oh my love.
I have to leave this you.
My heart shatters when that touch happens.
Farewell.