I see is that there are many people who destroy their marriages because of one-night stands with someone else. And as the French say, "C'est ne pas grave." It's not something easy to swallow, but at the same time, it does not justify you to end a long-lasting relationship because something happened.
No one ever loses anyone. We are all one soul that needs to continue growing and developing in order for the world to carry on and for us all to meet once again.
We don't always choose the best solution but we carry on regardless, trying to remain upright and decent in order to do honor not to the walls or the doors or the windows but to the empty space inside, the space where we worship and venerate what is dearest and most important to us.
Each human being has the right to two blessings, which are: the blessing to do right, and the blessing to err. In the latter case, there is always a path of learning leading to the right way.
What is a teacher? I'll tell you: it isn't someone who teaches something, but someone who inspires the student to give of her best in order to discover what she already knows.