Perhaps the relationship between Thunder and the rest of the group is not a good fit.
It's an unusual situation to begin with. If he has issues with communication, he might be better off pursuing some other avenues.
I realize that to some people, this might sound pessimistic. In some ways it is. But I'm intending to say that just because people care for each other does not necessarily make them compatible as life-partners. Maybe everyone concerned WOULD be better off with Thunder as "just a friend".
It would be super-grooovy if Thunder would come on here and give us all his side of the story.