Hello Rumnraisin, can we offer you a warm welcome to the forums and understand the situation you are facing.
One of my concerns is that as you run a business together and due to his addictions, you can never be certain if or how much money maybe missing, simply because unless he is undergoing help with this addiction, it's virtually impossible to stop him from his urges.
An addict can't promise anything in 2 or 3 weeks time, that's a long time for them to be thinking about, it's now that concerns him and whether he appears to not be using as much could just be a decoy to keep you there.
If your business had been doing well but now struggling along, irrespective of COVID-19, then an issue may not only have been created but only continued on.
What it does do is make him unreliable, not only with the business but also with family duties putting so much stress on you.
I can't tell you what to do, but suggest as you've said ' thinking all time of breaking up and having thoughts to end our relationship & business'.
If you do decide this, please secure what you need to, and would like to hear back from you.