My wife walked out on me in January and has cut me off completely

How do I survive this . Im 57 and my wife was my best friend. She kissed me goodbye when she left for work and didn’t come home , she has cut me out of her life completely and not spoken a word to me since she left for work . I have no family or friends and I struggle every day , just to make it through the day. I am so lonely and lost without her . I became homeless for 4 months but have a temporary place to live now . I dont see the point in living with this pain .