Thank you for your contributions!
I tend to consider as many eventualities as possible - as best as I can - including the worst case. In the event of bankruptcy, it obviously makes a difference whether you have a €1,200 installment or a €2,300 installment to deal with. I have to live somewhere anyway - with my partner. Assuming I could get out of the situation without private insolvency, I can definitely manage a €1,200 installment (together). With €2,300, things get dark much faster. And in the case of private insolvency, everything will go to pieces anyway. Maybe I’m just being too anxious.
Of course, you can sell the house if necessary - but with prepayment penalties, etc., it’s no fun either.
The "reason" option would therefore be a cheaper house. We’ll see, maybe that will take care of itself - there seem to be a number of interested parties - if they really start bidding up, I’m out anyway - you have to set a limit for yourself and then stick to it. Actually, it’s already above my "comfort limit" right now.