Need to vent and have someone tell me I'm right

Quick background. Sept. '12 husband isn't happy. Oct. '12 find out about affair with 23 year old (he's 50). He moves on Nov. '12. Now Feb. '13 he's been seeing a 29 year old with child. We are separated but not divorced yet. He is seeing her when he has my boys with him. I told him it wasn't right and that anyone would agree with me. He says "it only makes sense that we'd all be together". My boys are almost 5. They are asking me who she is, etc. "Is she our cousin, mommy?" How do I deal with this? Even when we official divorce I think I can put it in the document no overnight visits with people who aren't related but I can't stop him from seeing her when my boys are around. I can't follow him around. How do I handle the anger this causes? Please tell me he shouldn't have our boys around her.

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