There is a good explanation for it.
*Swtor Revan spoilers*
First off it is around 300 years when bastilla shan was alive.
Jedi around that time werent allowed to have relationships aswell.
but the jedi council at the time made an agreement with revan and Bastilla since it was revans love that brought here back from the darkside cause by malak.
So the council allowed for them to get married and have all the things you are allowed to do as husband and wife obviously. But under the agreement they both remain a jedi but they keep out of jedi affairs and dont try to influence other members of the order with revan and bastilla's new age jedi thinking or something dont remember details. so they were allowed at that time
