It would have 'melted your heart' [=it would have filled you with compassion, sympathy, etc.] to see her lying in that hospital bed.
Her anger 'melted away' when she saw that he was truly sorry.
He seemed to 'melt into' thin air. [=he seemed to disappear]
(..) l got the Buckwheat. Disgusting. What a beautiful, sunny day. Oh, my God. What happened to the sun? Easy, white chocolate. l wouldn't want you to melt. Hey, kids! You guys want to make $? Okay, here's what l want you to do. Yeah, l'll take the usual. And put it on my tab. Hey, Latrell Spencer! (..)2004 White Chicks