What should I do? I'm 4mos. pregnant and my husband is always on myspace.?

My husband is always is on mysapce. Myspace its not the problem what he does on it whats upsetting me.I have an mysapce page so to me its okay but hes on there all day evreyday day talking just to women none else. When I say something to him about it he's sorry accuse is that he's uplifting black women with his poems. I'm high risk with our baby and the toll on stress is running havoc on me. What should I do? Oh yes he just caught IMing one if the girls and calling her.