I agree with SailingAlone about the child support, that supporting her (within reason) would be the best solution.. you will have to act very carefully right now, because if you were to refuse her child support that would be used against you later.
M: 8 yrs T:14 Twins:7 S:5 BD:'NLILWY': Feb/2013 Mar/Apr/May: MC June: "living in limbo" Sept 12: H moves out Oct 20: reconciling Jan-Feb 2014:MC Feb 2014: separating, and H moved out.