Can anyone help me with this question ?

my fiance has just recently lost his ex-girlfriend she died back in January this year but since I think June this year he has refused to take a shower he won’t even take a shower on his own and when i confront him about it he just makes an excuse and walks away from me it is starting to bother me as a horrible lingering smell in the flat is appearing from him and i can smell it i can’t leave him as i have no where else to live
Does it have anything to do with his ex-girlfriend once living in this flat with him