Hold out on
Definition 1 of 2

Secretive Implications
Suggests the person is being intentionally secretive for personal reasons.

He seems to be holding out on the details of his new project.
Trust Issues
May imply a lack of trust or fear of being judged.

She's holding out on me; maybe she's afraid I'll react poorly.
Subtle Pressure
Often used to gently accuse someone of not being fully open.

You're not holding out on me, are you? I thought we had no secrets.
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