At some point, all business partnerships end, one way or another. When things work out, the partnership ends when the business is acquired, and everyone walks away with a truckload of cash. This happens a fair amount of the time (or nobody would ever enter into a partnership).
Unfortunately, the reality is that many business partners will not achieve the goal of a big payday, and for whatever reason, you may decide that you’re better off going forward without your current partner.