A.T. Robertson Commentary Luke 22:62

"And he went out, and wept bitterly." — Luke 22:62 (ASV)

And he went out and wept bitterly (κα εξελθων εξω εκλαυσεν πικρως). A few old Latin documents omit this verse which is genuine in Mt 26:75. It may be an insertion here from there, but the evidence for the rejection is too slight. It is the ingressive aorist (εκλαυσεν), he burst into tears. "Bitter" is a common expression for tears in all languages and in all hearts.