"Thank you for reaching out to me with such a sensitive issue. I cannot image what you might be going through right now. Nobody wants to disrespected in a relationship and everyone deserves to be loved.
I want you to know that no amount of anger or saddness given by others is worth taking your life for. You make this world a better place! Yes, difficulties will come by, by its nothing that one can't learn to deal with.
I understand that you really love him and it is difficult for you to let go. But often love isn't enough in a relationship. You can't force someone to be with you. Similarly, neither can he or his mother force you into running the business.
Before making a decision, take enough time to think if you really want to resign, because the company I am assuming, is as much as your as it is his. If you really wish to continue, you can try to separate your professional life with that of personal. This may not be easy, but it is possible with the right help. And it is completely okay if you wish to leave the company as well.
Make sure you do not take any haste decisions. Take your time! And don't forget, you're amazing!
Next Steps
Reflect on your thoughts
Health Tips
If things still feel overwhelming, it would be advisable to talk to a therapist.