It's that hope that things will work out that causes suffering and disappointment.
"I'll be nice, and others will be nice in turn" is magical thinking. There is no such deal in place.
It's perfectly possible for others to soak up all that niceness and then suddenly leave without being equally nice in return. If pressed, they might even say they didn't ask for the goodness that befell them, they were just happy to accept when it was offered, thereby absolving themselves of any obligation.
"I'll be nice, and others will be nice in turn" is magical thinking. There is no such deal in place.
It's perfectly possible for others to soak up all that niceness and then suddenly leave without being equally nice in return. If pressed, they might even say they didn't ask for the goodness that befell them, they were just happy to accept when it was offered, thereby absolving themselves of any obligation.