1. The way I think about it is that you have a goal/vision for why you start the project. Having a co-founder is very important and necessary to achieve this goal because your business will run into a number of roadblocks that you need a partner to help you go through it. However, whether or not your co-founder works as hard as you is really irrelevant.
You said that you are doing well financially and aren't starting these projects because of money. Then who cares if you "only" get 50% of the company? Your goal and intention is to solve a big problem. Get focused on that. The world is gonna pay you back in so many other ways than your 50%.
The other piece of advice is try to be really picky with your co-founders. Find ones that you trust and have worked with before or can get amazing references about. That way you know that he'd do his job the best way possible regardless of how many hours he puts in.
You said that you are doing well financially and aren't starting these projects because of money. Then who cares if you "only" get 50% of the company? Your goal and intention is to solve a big problem. Get focused on that. The world is gonna pay you back in so many other ways than your 50%.
The other piece of advice is try to be really picky with your co-founders. Find ones that you trust and have worked with before or can get amazing references about. That way you know that he'd do his job the best way possible regardless of how many hours he puts in.
I hope this helps.