Talk to Kathrine and ask her about Employment. After some running around town your character will get the idea to have Kat join the Tel'Adre Watch.
To get her into the Watch you need to speak to either Urta or Edryn. Since Urta is currently heartbroken she won't listen so you need to ask Edryn instead.
Like Urta she's at the Wet Bitch but only at night.
Edryn will allow Kat to join, then talk to her and you'll have to train her to become a member or the Watch. If you choose to train with Urta she'll say something like "I thought you hated herms."
The option to date Urta will be open again as long as you do not pick "Just Friends" or "Destroy Her" (Especially not the latter. Yikes.)
There are a few other ways to break her heart but they're pretty obvious.
Also, if Marble is your lover and Urta asks you about her do not lie or refuse to answer, you have to tell the truth. You'll still be able to date Urta but it'll become impossible to max out her affection.