Hi Jason,
i split with a business partner and closed my company in 2017 after 14yrs. It was a terrifying decision at the time but pretty soon after it was a big relief. There are many reasons it came to an end, some of it was based on disagreement over the direction the company was headed but other things were completely out of our control as well. (industry trends; consolidation of work; evaporating budgets) but i guess at the end of the day i had really got far away from the whole reason i got into this industry: making awesome stuff on computers with other wildly creative people. I was doing more managing and sales and although we prob could have kept it going i just wasn’t into it anymore. People also change over time, partnerships are not etched in stone. Many of the greatest partnerships in history come to an end at some point. Its good to know when it’s run it’s course and have an amicable parting instead of digging in and fighting to the bitter end. Unless your partner did something completely bonkers and had to leave the country suddenly 
its likely you both pushed each other and learned from one another. Try to keep that in mind altho it can be very hard when you no longer agree on the way forward.
17 years in this industry is an amazing run. Many many many companies in this space don’t last half as long. A lot of the companies i worked at are long gone so you should be proud of what you accomplished. I had a few interesting offers after closing the shop but i decided to go freelance instead. I worked at a lot of companies and met a lot of new artists which was exhilarating and also really challenging. i loved it. Im back at a staff gig again after staying focused on those things i know work for me: working with other awesome artists and making cool stuff, being challenged and learning new things. Like Albert Einstein said: “Life is like riding a bicycle. To keep your balance you have to always move forward.”
good luck to you Jason and FLAME ON!!!