unburden (oneself) to (someone)
To share one's intimate emotions, thoughts, or secrets with someone else, especially that which is troubling, stressful, or distressing. I had simply asked him how things had been, when suddenly he unburdened himself to me about all the problems he's been dealing with in work. I apologize for unbosoming myself to you like that. I just haven't had anyone to talk to since the divorce.
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