—aelitta—Getty ImagesI don’t expect anything of my friends that I don’t expect of myself.But lately, I’ve found myself disproportionately annoyed by tiny breaches of friendship etiquette. If I ask a friend to dinner and they say they’re busy without suggesting another date, I feel slighted. If I introduce two friends and they start hanging out without me, I wonder why neither thought to include me. Then I wonder: am I holding my friends to an ou…