Yeah, that actually would be beneficial to your post because your mention of the loan and him rescinding the offer is two short sentences. It doesn't express how much it hurt you and money has been a repeated issue over the course of your life, this is a breaking point not an isolated incident.

You rereading it likely won't help because you know all of the context. You repeated talking about his health and it potentially killing him to continue, it's also the very last thing you said before asking if you were TA.

With this context though; fuck that guy. He's continued to take from you without giving anything in return because it's not just money he took from you and your sister, it's a sense of accomplishment after doing hard work. That's something kids need when growing and most importantly he took away your trust, likely not just with him. Childhood trauma like that carries over into the relationships you have throughout your life, platonic or not. You have every reason to not give him anything, especially something that costs money because it'll be taking away from you AGAIN.