Until we meet again
The phrase 'Fino a quando ci incontriamo di nuovo' is typically used as a parting phrase in Italian. It expresses the hope that the individuals will see each other again in the future. It can be used both in formal and informal situations, and with both singular and plural subjects.
Until we meet again, enjoy your life.
In this phrase, 'Fino a quando ci incontriamo di nuovo' is the condition that precedes a wish or an advice for somebody: in this case, the other person is encouraged to enjoy his or her life until the moment of the reunion.
Remember to smile until we meet again.
This phrase is a gentle reminder or a suggestion intended for someone else, asking them to stay positive 'until we meet again' - 'Fino a quando ci incontriamo di nuovo'. The use of the phrase here implies a certain degree of emotional attachment and care from the speaker towards the person they're addressing.
Until we meet again, I won't change my feelings for you.
This phrase uses 'Fino a quando ci incontriamo di nuovo' to indicate persistence of a state or condition - in this case, the speaker's feelings towards the other person - until a certain point in the future (the next meeting). It is often used to express strong emotions and deep commitment.