i make a THIRD of what he makes and i depend on him to help me cover my expenses.
Have you figured out how to fix this? There is only so long he'll support you should he fully give in to his crazy desire to divorce.
You needn't apologize for your anger, TTA. You need to let it out somewhere, somehow...just not at him.
When I read what you wrote I think back to some things I told my W. I didn't mean to be mean, but I was. Mouth working before brain.
That doesn't make an excuse for some of the blame and ideas he's passed on. You both need to take responsibility for why lay where and move forward. In a M, debts are shared unless (sometimes) they are from before the M. So the bike debt is your debt, too. So is the bike. Accepting monthly payments to pay it off could work...why can't he get his own loan to keep it?
Anyhow, instead of calling his sister, can you go in there and meet her? She is your SIL and it might be good to get your feelings out in the raw to her. She might be able help you find ways to pass on the info in the best way.