Financing after separation, what happens next?

She finishes her training exactly in June 2023 [..] She’s making it relatively easy for herself in the whole matter and wants to offload it onto me.

So she is in training and has no attachable income? If she also has no money saved up, then yes, she can actually lean back. You pay the loan alone at first or the bank garnishes everything from you through your employer. You are fully liable. I stand by it, pull the emergency brake.

I would also say, one should not throw the sausage after the ham. Pull the ripcord.

finished with the training, how old are you? late ten?

that it will work out after all

and in a few months it will work out after all

Am I reading this right that you still have hopes for the relationship and are therefore hesitating with the sale? If you are honest, how realistic is the whole thing? And how much time do you have left until it really takes off? Such an emotional turmoil is not rational, but try to set yourself rational fixed points by when you have to have made which decision. If in doubt, I would tend to first dissolve the purchase contract. Everything else can still become very unpleasant.

Sorry, but which bank finances such a nonsense structure with an unmarried couple and a borrower in training?

How we get out of the contracts, no idea. And if I ask now and in a few months it actually works out, that’s also crap.

Am I reading this right that you still have hopes for the relationship and that's why you hesitate to sell?

Maybe quickly father a child with the woman to save the relationship? ;) no... anyone who casually buys, builds, or signs for a six-figure house for fun and then changes their mind is totally unsuitable for a long-term relationship. Close it immediately, anything else only postpones the breakup until there really are children. And then holding a house alone is all the more impossible.