Conversation so far:
Is Mick Jagger married?
Mick Jagger is not currently married.
Did Mick Jagger date anyone famous?
From 1966 to 1970, Mick Jagger had a relationship with Marianne Faithfull, the English singer-songwriter/actress.

Question: how was their relationship?
Self-contained rewrite: How was Mick Jagger's relationship with Marianne Faithfull?