Do NOT keep any of the money you've saved in a joint checking account or savings account. Put all of your own money in separate accounts in your name only. And do not buy a flat, a car or anything together.
He clearly is unreasonable and so controlling that he can't understand or accept a woman that can be friends or give advice to a man without there being anything flirtacious about it. You should want to break up with him regardless of what he wants. If you helped a male neignbor with advice in the future or any male, then this man would have the same unfounded suspicions and accusatons.
Is that the future you want becaise it shouldn't be. You deserve much, much more respect for how you're helping him in his shop etc. He owns the shop and it's in his name. You just work there to help him.
He's keeping things separate in his mind because he's about control and power. You're blending them because you want to feel part of a couple. That can be a dangerous attitude and put you in a very weak financial posiition.
I would plan to move out since he's been clear that any future will be all about him and very little about you and what you want or need. His age and cultural background is part of the way he feels but that will not change for him. If he was going to have a more modern and reasonable attitude, he'd already have it.
Tell him to buy out your half of the business and be done with him.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.