Hello Charly,
You could say:
" I am not sure, I could (should) tell you my secret."
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"I'm not sure if I should tell you my secret" sounds better
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Hi... That's ok...
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Yes, it's ok. I got the idea. You want me to shut my mouth after you tell me something really important for you, and the fact you trust on me to keep it.
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To say this formally it would be,
`I am not sure I can confide in you.`
or casually
`` I am not sure I can trust you with this secret``
or
``Would you be able to keep my secret?
``