This is probably old advice but it has worked for me in many areas.
Pinpoint your triggers and don't focus on your reaction. If you focus on how you react then you'll never get to the root of the problem. If things are recurring, you probably aren't going deep enough. Re-think what triggers you....then go deeper. What is the issue behind the issue? You say you don't feel like you are enough for anyone. Why is that? Because LR has another man? If you are coming back to that over and over then you are missing the true reason she has GG in her life. Your not going deep enough. You have to truly believe her reasons for having him in her life to get past the cycle you've created.
Just my thoughts my friend.
Your an example on this forum and lots of people recognize the strength you have as a husband and a man.
Playing the Game of Life with Monopoly rules.
Monogamy might just be in my genes
Poly Events All Over