Paying "rent" to the partner... how?

So, honestly, that sounds like significantly more than just a question of cost sharing. He’s giving up having children for you? And that’s now supposed to be compensated financially? And the whole discussion is relationship-threatening over 1-200€? I think you’ve already named the right conclusion:

What is my alternative? Looking for the perfect partner?

Interest costs 250€, additional costs 150€, depreciation 100€, it's not nice, but also not horrendous.

Interest costs 250€ = total interest costs 500€ = loan 600K€ ==> and then all the money from the family as equity ==> your partner is really treating himself to a nice luxury house
Depreciation? What are you depreciating? What does he pay you, since he is also wearing you out. You won’t be more attractive to new partners when you’re older. Mean, I know

You really have a problem...

Insisting on paying only 400€ and ending the relationship because of it (and then paying even more rent again)?

If he insists on the money like that and pressures you, you've already mentioned the consequence. What else will come then? Do you have to pay for depreciation if you pay for his kitchen? Refuel his car because you were driving it once? Etc.

It's not about a new build. What does it mean to really reach into your wallet... Interest costs 250€, additional costs 150€, depreciation 100€, it's not nice, but also not horrendous. What is my alternative? Looking for the perfect partner? Not moving in there, long-distance relationship or still paying more rent together? Insisting on only paying 400€ and ending the relationship in the end (and then paying more rent again)? The last word hasn't been said, but just as he gives up children for me, I might give up 100€ a month for him.

What kind of properties is he looking at in the Stuttgart surrounding area? And where is his pain threshold? Everyone writing here who wants to buy or build around there is vomiting about the prices. I suppose that around Stuttgart nowadays you're looking at 750k€ if you want something nice with a good standard but not extravagant, right?

It feels like money is the priority... so having a partner like that, puh, would be difficult for me. Something like that can cause a lot of stress in the long run... I'm glad that my girlfriend and I think very differently about that and see it more relaxed...

Oh guys, this topic is about a money question, of course this question is the focus. What else? How nice the weather is? That doesn’t mean at all that it’s only about money with us. Everyone here has calculated whether they can afford to build/buy a house and has also partially discussed this here in the forum. Still, there must have been more than just this one topic at the dining table with the family and still, the topic of money must have come up with each one of you as well.

Not to mention that none of you have to live in our relationship and of course you are better people. Stay grounded.

And that simply goes too far.

In the end, you have to decide for yourself. We do not know your relationship and do not want to interfere.

I just find your boyfriend's way of thinking strange. And apparently you do too, to some extent, since you want to secure yourself, which is understandable; that’s why you asked the question here.

In the end, you have to find a consensus and he must structure the financing so that he can pay off the house alone without problems if necessary, which is also required by the bank.