I doubt that after your marriage you will automatically live in the town of your wife.
It all depends on your so called Aufenthaltstitel (residence permit/ legal status).
If you both have the status of recognized refugees and the 3 year permission to stay,
you also should have the same rights as every German citizen and be free to choose the place
you live after your marriage.
If you only have the status of subsidiary protection or national ban on deportation, or your decision is still pending, things are different.
You would have to make an official request/ application at the Zentrale Ausländerbehörde in Dormund, that you
want to live with your wife in her town after the marriage.
The Ausländerbehörde should contact the authorities in the town of your wife and arrange things with them after your marriage.
I would recommend that you contact them even before the marriage to speed things up.
Please be aware that I am not a lawyer and this is just a general recommendation based on info I found on the Internet.
Living and Moving law for refugees: