Were someone to ignore their issues or hide them from their partner, I would claim it destroys the relationship more than anything else. But admitting one's flaws? As much as you may judge someone for a lack of self-control, you have a respect the honesty it takes to admit to your S.O. that you lack that self control.

Even moreso, it's a very strong indication of your commitment to the other person when, after admitting your lack of self-control, you consciously choose not to put yourself in those situations because you know how much it would hurt your S.O.

tl;dr; - A relationship where both parties are honest with each other and ok with the situation after being fully informed is the strongest possible relationship.