There is a saying "all that looks good to you, may not be good for you." The first mistake was exchanging contact information. The rest is, as you say, "a moment of madness" that caused you to lose your future.
All that time, you had the woman you needed, but took her for granted. If you so easily did that to Mable before you were married, I can only imagine you doing that after. Hope you've learned your lesson throwing away a diamond for glass.
Congrats to Mabel. Now, your loss is another man's gain.