This is very complicated.
This is my summary of the figures
So you bought a house between you for €300k. She provided €90k of it and you provided €10k of it.
The house is worth less than you paid for it. So there is no increase in value due to you.
You both benefited from the repayments while you were living there. The repayments would have been a lot less than renting an equivalent house.
If she were to sell the house today, I would say that you are not entitled to anything.
Likewise, if she sells the house in 11 years, I don't think you would be entitled to anything either.
Another way of looking at it
You stopped paying the mortgage in 2014. At the time, the house was worth about €150k and the mortgage was €160k, so you were in negative equity.
How the judge might look at it
And I understand that there are no guidelines so the judge could order anything.
"Sell the house in 2031 and give your ex half the proceeds after the mortgage is paid off."
The judge could even order that your name be taken off the mortgage. Such an order would be invalid, as the bank would have no obligation to do so.
It's likely that the judge will take the overall picture into account. How much maintenance you are paying. How much your rent is. etc.
How the bank will look at it
They won't care as long as your ex continues to pay the mortgage
They won't take your name off the mortgage unless she has the income and she cooperates.
What does your solicitor say?
You do not want her to sell the house. But you might have to issue proceedings to seek a sale of the house. Her solicitor will advise her that there is a risk that the judge might agree. Then she might talk to you via her solicitor.
Brendan