A basic Torah principle is that there are no accidents in this world. Whatever happens, happens for a reason. Throughout your life, G-d will send you messages. The wise person learns from everyone (Pirkei Avos 4:1). Be wise and learn from all the messages that have been sent your way in the past and those that will be sent your way in the future. Every time you see a couple interact it can be educational. Even listening to the way a newly married couple or to an elderly couple speak together in a line at the supermarket can teach you something. At times you will hear a positive way of talking that you can emulate.
At other times, you will hear a negative way of talking that you may find similar to your own. This can be a wake-up call for change.
There are also situations which will enable you to feel fortunate for your own situation. You will gain greater appreciation and gratitude for what you previously might have taken for granted.
(From Rabbi Pliskin's book entitled "Marriage" - ArtScroll Publications, 1998, Chapter Two, p.113)