noun

the action of deserting a person, cause, or organization.

I resented what I saw as my parents’ desertion

abandonment,leaving,forsaking,betrayal,neglect,shunning,stranding,jilting,relinquishment,renunciation,defection,reneging,repudiation,forswearing,abjuration,apostasy,absconding,running away,decamping,flight,fleeing,flying,bolting,turning tail,truancy,going absent without leave,taking French leave,departure,escape,dereliction,treason,cowardice,going AWOL