What are good dating questions
If the other person is opening up to you but you are not opening up to them, they will quickly become uncomfortable. They can protect your conversations from grinding to a halt, and they are a powerful tool for building intimacy and rapport with your conversation partner.
However, as handy as invitations are, you can't build an entire conversation out of them.
When you ask your partner questions about themselves, you're not just telling them you are interested in them---you're showing them that you care.
For a question to be a good invitation, it needs to satisfy the first two rules I listed above, and it also needs to be open-ended.
Eventually you might get to a place where they are comfortable sharing very intimate things with you, but that will usually happen after you have shared many conversations together.