Try these books out "As a Man Thinketh" by James Allen. This book will help you focus on you and become a better you. You can read or download it for free on the internet
Also. "I Do Again" by Jeff & Cheryl Scruggs. Lots of hope in that one.
You've gotta be a more confident you and that letter doesn't relect that at all. Do those things you wrote about as everyone is telling you. Don't send the letter.
It's a long road Kevin. You have as much time as you want to wait. Be patient. Take a chance and become a better man, not in a weak, needy, depressed sense, but in a strong, happy confident, fun, loving way. You have to stop worrying about what she's doing and saying. Concentrate on you, your negative, weak and unmasnly thought patterns and think good, beautiful, manly thoughts and see if your circumstances don't improve.