Hi there Anon111 and thanks so much for reaching out to the forum.
I am so sorry to hear about the personal pain this is causing you.
I am not a qualified life or business coach but can pass on to you how I handled my decision to split with my business partner that was a bit similar.
You have not mentioned the nature of the betrayal - if I can understand a little more about what the betrayal was it would help. Was it personal or business?
Anyway a good friend and I owned the Australian import agency for a brand of sports goods. He handled the importing, I set up the distribution network and agents in each state. He was always a little 'loose' with details which got us into trouble with the Government over import duty. We managed to sort it out then another incident happened which was entirely avoidable and cost us dearly. Then he formed a relationship with our receptionist although married. I thought long and hard if this was the future I wanted as the business grew - it wasn't.
So I told him I wanted out, and saw an independent accountant about an exit strategy. This is not hard to work out and are based on precedents. The business was valued, we agreed a timeframe, my financial responsibilities were erased and we parted on reasonable terms. The business went broke less than a year later. Phew! I was glad I acted when I did.
I see that your partner seems to not have much empathy for you and little respect. As a small business grows, partners must have the ability to discuss and resolve problems because they will certainly arise - financial, premises, salary levels, profit sharing etc etc. Do the two of you have a formal agreement? Is it a partnership? What happens with financial responsibilities - funding, loans, debtor control?
With Microsoft, Bill Gates and Paul Allen often disagreed but managed to sort things out as they respected each others abilities and input. Lots of sparks all the time for many years. But as the business grew, Allen was blindsided by Gates and decided to exit the company after many disagreements. Allen was happy as that made him a very rich man.
I guess the point here is that without mutual respect, understanding, communication and empathy, a partnership will not prosper.
Most accountants can give you clear advice on this, and Google will have lots of info on partnership and business dissolution.
I sincerely hope this helps a little Anon111 - I am very happy to discuss further if that would help.
All the very best, The Bro