I have caught my wife 3 times with a man

Hello Mama Zimbi, my name is Victor and I am 38yrs old. I have been married to this woman for the past twelve years and we have three children. I have lost my job and for the past two years i have been dependent on my wife for survival. She operates a shop of which i provided her with the start-up capital

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Mama Zimbi, within the last eight months i have caught my wife three times with having an affair with man. The first one was by a tip-off from a friend, the second and third were by accidents. Mama Zimbi, my wife appears defiant and will not even apologies. I want a divorce but can i sue for alimony?

I need an advice please.