Before revision: An on-again, off-again relationship (also known as an on– off or off – on relationship) is a form of personal relationship between two persons who keep breaking up only to reconcile afterwards, thus repeating a cycle.
After revision: An on-again, off-again relationship (also known as an on– and – off relationship) is a form an interpersonal relationship between two people whose breakups are followed by reconciliation, perpetuating a cycle.