It's about handling an ex like human being and being more careful as to how your attitude and actions affect them. It's not as though thceir role in our journey was ever granted, especially their being faithful and non abusive like the question specifies.
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I mean, if he's an ex, the person who broke up doesn't have the obligation to keep being friends with them, but they deserve all the compassion, praise and appreciation in the world. And hopefully someone who'll hug them so tight, all their broken pieces will fit back together.