Dax was willing to disregard trill society to be with Lenara who she was married to in a previous life.
Assuming Lenara did come back later but after Jadzia and Worf had already gotten married do you think Jadzia would break her marriage vows with Worf to be with Lenara, someone who she also had marriage vows with in their previous lives?DAX: Can you really walk away from me, from us? After all this time, we're together. Don't throw that away.
LENARA: I don't want to! Maybe I need more time. Maybe if I go back to Trill for a while, think it over. I can always come back later.