So my friends wife is moving to texas at the end of June but refused to sign for divorce?

My friends have been in a quarrel for the past almost 6 weeks. She wants to work on the marriage of less than 3 years, and he's completely done with her. They are still on talking terms, and he's already filled out a joint petition for divorce like a month ago. But she has refused time and time again to sign, saying she was going to come back in January and sign papers for either seperation or divorce. He's getting the feeling that 6 months from now is January she will be a legal resident from texas, so she will have different laws and such she can abide through if she decided to take action of any kind while down there. He asked her to sign yesterday again so they could file today but she said no, and then later brought home filled out seperation papers. He doesn't want a seperation, he wants a divorce. Do you have any advice, she he just have her served? Do you have any insight on why they should just do the divorce