Your significant other is supposed to be the one you confide your hopes, fears, dreams, annoyances, and secrets to. They should respect you enough to let you peak inside their psyche, even if that means some tough questions and difficult conversations.
The worst thing is finding out about a secret they've been keeping from you. It might have been tucked away for days, months, or even decades. Humans make mistakes; we're not perfect and we shouldn't try to be—but when you try to cover up your alcoholism, your affair, your tarnished past—little clues of deception start to seep out of you like molasses, until you can't keep up the charade any longer.
Holding in terrible secrets from your partner is not the way to an open and honest relationship, but instead, a dreary path into fear, trickery, and deceit. Will the lies be worth it in the end?