when is enough to be asking the mpther in law to have her own place!!

13 yrs marriage 2 children living in extended family situation My mthr in law living with us My husb very nice man cant see how i have felt over the last 15 yr by him not acknowledging how i feel So now i said she cant live with us anymore but willing to build a new place to give her a granny flat so she can be part of his life but not mine instead he said no too much history better we go separate ways but i know his not sure what he wants tired and just want my marriage we only get a break when she goes overseas but then his like mourning for a few mths when she goes then when returns and back to square one hmmmm!!! tired and massive headache