Even if Henry had known that David Banner was using him as a target to drive a wedge between them, he still would not have stayed behind to try to explain things to Bruce Banner. Matters like this only became murkier the more one tried to explain them.
The best approach was to let things cool down. Besides, he had been planning to leave anyway. New York was his home turf now; California was already in the past. Stay behind and fight a lawsuit with Hulk? Had he thrown his Super Brain away?
Only after Bruce Banner had calmed down, let things settle for a while, and become willing to listen to Betty Ross's explanation could this matter possibly be cleared up. And Betty Ross had to be the one to explain it herself. Henry showing up would only make things worse.
If Bruce Banner had been consumed by jealousy and trust had collapsed from the very beginning, then even if Henry stayed, refused to fight back, and let Hulk pound him to pieces, that man and woman's relationship could never return to what it had been.
A crisis of trust between a man and a woman was a problem with no right answer.
But in reality, Henry had absolutely no awareness of being treated as a third party. He did not even know this was happening. He was simply driving his slow RV, accompanied only by a tiger and some music.
This kind of life was wonderfully beautiful.
He suddenly became interested in the wandering life Jack Reacher had mentioned before—using his own two feet, the simplest way possible, to go everywhere and see everything. He even felt a faint hint of envy.
But that big guy had also bluntly said, in a mocking tone, that he was a