No one denies that anyway :)
For me, it’s more about when a life partner – meaning the OP or his partner – passes away. Usually, the partner is designated as the heir of the shared property. If you are not married and, for example, have no will, the partner might end up with nothing. Not to mention the inheritance tax (inheritance tax class III).
Marriage simply simplifies a lot... So I wouldn’t finance a house without being married...
Not wanting to marry in church is understandable. No big party – understandable. But seriously, what’s the problem nowadays with just going to the registry office – getting married and that’s it. Not to mention that in most cases you even gain a tax advantage. I don’t quite get it :D Nowadays, about 50% fewer people marry than ten years ago – for whatever reasons? Especially when children are involved, I find that really strange. Sometimes there aren’t even wills or anything written – if something happens, the families have a real problem...
After so many years of relationship like the OP’s – after buying a house and planning children, I would definitely recommend it... Much fewer problems arise when problems do occur :D
@OP:
Otherwise, I don’t find your financial situation suitable for the property you want to buy. In my opinion, you either need to save significantly more, lower your expectations, or earn more/wait in order to afford a home. I actually believe, like most here in the forum, that you’re not doing yourself any favors with this...
Calculate everything very precisely again, have a frank talk with your architect, don’t let anyone push anything on you here, and very importantly: have discussions with different banks to get a feel for what you’re really “getting yourself into” with this financing amount regarding your life phase/income situation.