I think I understand the distinction you're making, but I'm trying to suggest to the Board that there can be other reasons besides being "cowardly" for not wanting to initiate anymore, or have "The Talk" for the 537th time with the spouse.
"Grab your 'nads" I think is the proper advice for someone who's NEVER confronted their spouse about this, or anyone that doesn't feel like their spouse took them seriously or in any way doubted the seriousness of the marriage situation. But if you've HAD The Talk, multiple times, cried together, prayed together, poured out your feelings in long conversations and e-mails about the depth of your sadness, anger and despair -- and then, NUTHIN', then there is simply a "I don't get a F anymore" that I think takes over.
Defeatism, yes. Cowardice, no.
I face tons of conflicts in my job every day, and even other conflicts with my wife in other areas of our life. I honestly really don't care if I offend anyone in these areas. I'm just at more of a "It offends me that I should have to continue to insist on this" stage that I am at, I guess.