You would really need to speak with a divorce attorney in your area on this.  Even if you decide to split the payments under your Chapter 13 plan equally and especially if you do not, arrangements for who pays how much and when will need to be spelled out; preferably in written agreement signed by the both of you.  There could also be other side issues involved that will need to be addressed.Again, an attorney will best be able to guide and advise you on all of this.