I'm a little late to this party, but I wanted to throw in my 2 cents, anyway.
IF the first Dday was rugswept and this one isn't... ok. I can see trying again.
Kind of like an addict who tries to quit, but hasn't yet hit rock bottom and doesn't find the tools to quit. If you think she's hit rock bottom - this time - and sustains the work and empathy... I can see trying again.
Look, I truly believe my FWH is the safest person I could ever be with now. Why? Because NOW he is the most self-aware, non-conflict-avoidant, honest, transparent person with ironclad boundaries I've met. If he hadn't been desperate to keep me, the woman he truly loves, if he hadn't been desperate to become the man of integrity that he always believed he was we wouldn't be here now. But he did want those things - more than anything he'd ever wanted.
I made him prove it, of course. It took a lot of time before I believed it, but just over the 2 year mark I did. Not because he does the right things and doesn't do the wrong things, but because he actually has changed who he is.
He used to believe that fun was getting falling down drunk and being the life of the party. He now sees how pathetic that was. Now he knows that fun is in times spent with family, with friends, camping, concerts, travel, a few glasses of wine, sure... etc. Simpler things.
He used to dislike who he was. As he got older, he felt invisible. He wasn't the cool guy anymore. He was losing his hair. Gaining some weight. Now he realizes that getting old is better than the alternative. He's good in his skin. He can joke about his age (that was a NO-NO before). He likes himself.
He used to be terrified of conflict, believing everyone should be happy all the time. Now he sees conflict as a means of connection. Paradoxical but true. It might be the biggest shift in our relationship and that makes him safer, too!
Because he isn't avoiding conflict, he is speaking up regarding his needs, his feelings. This is huge because someone who can't speak up, has no voice and is powerless in a relationship. That is a recipe for disaster because the ultimate way to grab power back is through an affair. Now that his needs are getting met, that makes him safer, too!
See, these are examples of actually fixing your Why's. It almost doesn't matter (to me) what FWH's FOO issues were. They may have helped create the why's, but understanding them doesn't fix them. They're fixed through self-talk and learning new strategies.
It's not all doom and gloom. It can be done.
If the first dday wasn't rugswept and your WW had ostensibly done the work and you were here again years later, ok I'd say cut and run. But it doesn't sound like that's the case.
Best wishes.