Construction loan - Ex-partner does not pay his share

You are right, I have never experienced anything like this myself and hopefully never will. It may also be that my empathy is different from yours. Of course, as an outsider, I am somewhat more objective than personally affected people.

Nevertheless, your self-protective claim that you feel justified even though the rule of law has ruled against you annoyed me greatly. And then you add morality on top of that. This is nothing personal against you, but generally a reflection of the spirit of the times, that facts (verdict) no longer matter, only vague feelings and who accuses the most nonsense.

Vague feelings.
Nonsense.
If you, as you yourself say, have never experienced anything similar, then please show restraint or do not comment.
Anything else is simply presumptuous.
Your statement, without having experienced anything similar yourself, as you say, is simply out of place.
I can only hope (and I really mean this from the bottom of my heart) that it stays that way and you never find yourself in a situation where you recognize that your beloved laws fail you.
And believe me, I am extremely upright.

No, that was about a year ago. But the loan was taken out 3 years ago... car leasing, consumer goods, etc. it added up, since despite her own relatively good income she didn’t pay for anything

So your husband has been paying the full installment of €550 for the last 3 years and hasn’t gotten his share back from her? Or has he paid €275 towards the loan, and she paid nothing? If the latter, doesn't the bank complain? There must surely be an agreement on the amount the installments have to be paid.

Fuzzy feelings.
Dirt.
If you, as you yourself say, have never experienced anything similar, then please be reserved or do not comment.
Anything else is simply presumptuous.
Your statement, without having experienced anything similar yourself, as you say, is simply out of place.
I can only hope (and I really do from the bottom of my heart) that it stays that way and you never find yourself in a situation where you realize that your beloved laws let you down.
And believe me, I am extremely upright.

In advance: nothing similar has happened to me either.
Well, my opinion is that you are of course reacting emotionally because you felt you were right. You did not get this right enforced. That feels unfair. However, it is called jurisdiction, not justice administration. Laws lag behind, courts have free assessment of evidence, and so on and so forth.
Ultimately, however, a judgment was made based on German laws. The laws have partly developed over thousands of years and have led to a obviously fairly reasonable coexistence. Sometimes it goes wrong in individual cases.
But to advise everyone directly against pursuing legal action, I consider to be inflexible and questionable.
This is obviously a person who cannot be reached with decency and morality. Personally, I would choose the path that hurts her. By the way, a legal reminder procedure is also possible. If she does not react again, the amounts are recognized... So dear OP: get legal advice! Only the lawyer knows all options and consequences. Nobody here knows them in your situation.

So your husband has been paying the full installment of €550 for the past 3 years and hasn't gotten his share back from her? Or has he paid €275 on the loan, and she none at all? If the latter, doesn't the bank complain? There must be an agreement on the amount the installments have to be repaid.

Exactly, he has been paying the full €550 so far. At the time the loan was taken out, she said she wanted to pay her €30,000 from her mother's inheritance (who is still alive). At the divorce (11/19) it was then agreed that each should take over the €275 installment, but he has continued paying the €550 alone for now, only she has been refusing to sign the SEPA direct debit mandate for her €275 for months...

Exactly, he has paid the full 550 € so far. When the loan was taken out, she said she wanted to pay her 30,000 euros from the inheritance from her mother (who is still alive). At the divorce (11/19), it was agreed that each should take over the installment of 275 €, but he continued to pay the 550 euros alone at first, only she has been refusing to sign the Sepa direct debit mandate for her 275 euros for months now..

My goodness, then he should sue if she doesn’t pay! Slowly I get the feeling that only you are suffering from the situation!

certainly right. My original comment referred to the post by , who said the mother had abandoned the children, one of whom was not yet of legal age. That’s what I got stuck on. After all, the father apparently left first.

That’s why it’s in quotation marks. It was an exaggeration of the situation described here, not a judgment on my part. I would like to make that clear. This is the introduction to the following paragraph, namely that the mother comes off badly and her version of the same story would probably sound very different.

When parents separate, they usually arrange the children’s place of residence. Here we may conclude that the children (mainly) lived with the mother. And now she also moves out, the children live alone. At the mentioned age, even for the minor, this is not (a big) problem. How long this has been the case was not said. If it is arranged that the children live with the mother, in my opinion a new agreement with the father is required if she wants to move out without the children, i.e., if the children are to live alone. (Of course only for the minor.) He would have to agree to this. We do not know whether such an arrangement took place.

I am separated myself, no longer living with the father of the children. So I am certainly speaking from experience.