In addition to that I would also like to point out the message of diversity. We can see that the candle and match belong to the same class and is different from the extinguisher. Yet the candle and extinguisher embraced each other while the match does not.
Another message is one of empowerment. The candle summoned up her courage and stepped into the unknown, a world entirely different from hers. Yet the match choose not too.
The other message is about handling problems and conflict. Instead of bursting out in flames, the match choose to sit calmly and contemplate, knowing it is not wise to fight with an extinguisher.

He sees her beyond her superficial means. That she is not just meant to burn herself for the satisfaction of others. By putting the fire out she now has full control over her life. Choosing her own purpose whether it is to be with a lighter, be a birthday candle or just back in her box. He is a saviour who gave her a second chance at life by sacrificing part of himself yet gets nothing out of it. The match on the other hand, is sour and failed to realise that unlike himself, she could only burn once when with him. His nature is destruction, used in the wrong way. For who would light a candle in the bright!?

Putting out the flame will keep her alive longer because she wouldn't melt to nothingness. A candle's existence is not solely for burning they can also be used for decoration.

The circle needs us

Yeah everything's too far apart to collide