Why do you want to confide in them?
I think it's a worthy question. I think if they are a person you're confident can help support you and talk to you, it's a good idea, if they are not, it's probably more harm than good. I think some people get stuck on this idea of accountability, but it doesn't make sense to me. You need to quit for your own reasons, so turning those reasons inside out so that you're quitting because other people are watching is not that effective.
Good luck anyway!