I had an eye opening experience myself, in the same arena. You need to get contracts/agreements in place now, even if some/none existed previously, detailing either that you are both 50% liable for existing bills up to a SPECIFIC date. But after that date, you are no longer financially liable, and exist solely as a consultant. Do it now.... or those four months of bills after may be shocking. Your partner may decide that if it's to be a sinking ship, it should be the Titanic. You don't want to incur ANY more than you are already liable for.

my .02 cents