A good adjective to describe someone who doesn’t like to talk about their feelings or confide in others.
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Not revealing one's thoughts or feelings readily.
More conversational terms could be buttoned up, reserved or even simply just private.
People who are secretive hide their feelings, thoughts, intentions, and actions from other people:
- He's being very secretive about his new girlfriend.
- cool or formal in manner; restrained, silent, or reticent