Of course, I love your story and I have enjoyed reading. But in me is a reluctance on Brian's stitiger behavior. I try to always tell myself that Brian is sick and therefore behaves as extreme. He went through a lot (his difficult childhood, the bashing, lost his son). But eventually he has to try to deal with it. And to kill themselves is the worst solution. Instead he inflict more pain on Justin (who had also a very difficult time). He should get professional help to overcome his depression.
Summary: Justin is too good for this world and Brian needs treatment for his depression to get them under control. And I'm Justin's opinion. "It can´t be that simple." I think it won´t be.
There is still a long way for both. Justin must learn to trust Brian again and Brian must build confidence in his surroundings / trust in others. Because he has tried alone for too long.
This story is incredibly emotional and intense and is a very difficult issue, but again you have created something really great. I look forward to the epilogue.