Try this
- Name the subject enough for the person to decide whether it is welcome.
- Ask before giving the full question. If the topic is declined, continue with something else without offering increasingly indirect versions.
A worked example
“Can I ask about that, or would you prefer to keep it to yourself?”
An invented example to adapt, not a real exchange or a script you have to follow.
Before you leave it here
A declined topic should stay declined unless the person chooses to reopen it.