I’m guessing the reason Adam had a falling out with Colleen is because he’s chosen to blame Sam and Matt for Shiro going on the Kerberos mission and dying.

Adam probably figures, maybe subconsciously, that if he doesn’t blame them for pulling Shiro away from him, Adam would have to blame himself for Shiro’s death. He pushed Shiro away and onto the Persephone.

It makes sense in a way. When people die, especially in sudden and unexpected ways, people often look for someone or something to blame, even if it was a complete accident or random chance.

Adam certainly doesn’t want to blame Shiro. So the only other people who could take the blame for his lover’s death are either Sam and Matt, the people who filled Shiro’s head with dreams and pulled him into the stars, or Adam himself, who held onto Shiro so tightly he ended up pushing his lover away and into the inky abyss of space, to never see him again.

that definitely is an aspect of it, yes!! though it's a bit more complicated than that, as things like this tend to be. and while we know that adam has a tendency to push everyone away when he's hurting (like he's doing rn with gold flight), in this case the falling out actually wasn't one-sided; colleen has beef with adam, adam has beef with colleen, they're both grieving, they're both very strong personalities that clash even in the best of circumstances, and the result is the Falling Out. I'm keeping things vague on purpose because it'll all be revealed later, but in this case adam actually isn't the only one lashing out and causing friction. for once lmao