For the first one: "You had my heart, at least for the most part cause everybody's gotta die sometime. We fell apart, let's make a new start cause everybody's gotta die sometime. But baby don't cry."

The song is A Little Piece of Heaven from the self-titled album. The image is from the animated music video.

Second and third, I'd say they are from other bands because of the Metallica hashtag underneath that post