My husbad has no love or feelings towards me or the child, what should i do?

My Hubby is having relation with other woman which is spoiling our relation. I have 1 month old baby and i'm in my mothers place to give proper care for the new born, meanwhile unwanted activities are happening in my hubby's place secretly. I see him changed a lot, has no love or feelings towards me or the child, what should i do?