Your post has ambiguity - was it you, or you adding into a dispute between two other couples?
If you were a main combatant, send a handwritten note - via mail - regretting that things got heated, admit regret for your actions, and express hope that your mutual friendship shall continue. If not, modify that note a bit, expressing regret that a spat developed, hoping that all parties can return to the previous - valued - state of amicability. Send the note, regardless.
That's the way that served well through several centuries. Never turn your back against your friends, and when spats inevitably occur, work to heal them.