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I like this more than movie clips because it's 100% real. And recently I witnessed this live at one of their concerts.
I put in the times to make it easier.
1:46 He starts to play the song and starts crying and has to stop.
6:57 Near the end of the song he starts to cry while he's singing. Then he falls to his knees and sobs for about a minute. His band mates come over to comfort him. Then you can see his face as he tries to pull it together, then he leaves the stage.
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Same band. This was during the making of a video for another song. I don't think this was staged because this sceen wasn't even in the video.
5:20 through 5:51