Fall out of love?

Hello my wife told me last month that she still love me but fall out of love with me. I love my wife very much never cheat on her, abuse her, hit her she say I dont show her affection. My wife is a workaholic she have a stressfull job, she have a fulltime and part time job, she taking cles, and her grandfather is in the early stage of Dementia which will lead to Alzheimer's. She not even interested in . I love my wife and this hole thing is fustrating I dont know what to do, should i just give her some space? Any suggestions