Growing up in a household where all my parents did all day was scream at each other, I suggest you don't stay together just for your son. If you can't provide stability for him when you & your husband are apart, why don't you get a duplex, or 2 apartments in the same building, or 2 townhouses next to each other? That way, you're not technically living together, but you're still close enough that it should be alright for your son.