My husband has slept with all our house girls and is currently dating a widow in the neighbourhood

I have been married for 13 years now and mine has not been a smooth marriage. My husband has a peculiar habit of seducing and sleeping with girls who work in my house. He always promises to stop but goes ahead and sleeps with the next girl who comes. He is now dating a widow in our neighbourhood. It has been so painful to watch. I don’t know why he continues to hurt me like this and I don’t even understand why I am still with him. He does not support the family financially — not even providing our basic needs. He leaves everything to me while he spends all his money on women. I don’t know what to do. Please advise me. I am hurting.