Although they both sound the same, they both mean different things. A confidant is a close person in which you trust and can tell personal details and things of a secretive matter; and confident is a way in which a person feels--like self assured or firm trust. One can be confident in the ability of their confidant to keep a secret.
Confidence - to be confident I am confident You are confident etc That's how to use it as a verb.
Confidence is a noun. "She has confidence." The adjective form of confidence is confident. "He is confident." The adverb form of confidence is confidently. "She walked confidently into the room."
"confidence"
The abstract noun form of the adjective confident is confidence.
to confide: verb
"confidence"
A word for full of confidence is, confident.
"confidence"
"confidence"
confident
The noun confident and the adjective confident have the adverb form confidently.
It's spelt like that, however a noun form is confidence, there is also self-confidence. Confident is the correct spelling.