Baby Mama and Girlfriend Drama!!!!?

Im friends with 2 girls thats messing with the same boy (ill make up a name) lia has a baby by mike, they went out broke up after the baby was born the baby was 9mnths, but mike doesnt want lia around any other men we were at the club and mike actually punched this guy in the face for seeing his (single) baby mother. he doesnt want lia around no other men, but mike starts seeing shanay. shanay is the type that starts everything on facebook, she writes on lia's facebook wall "yeah im in the bed with my baby mike, wheres the babymother lia? home with her son lol" this been going on since december 2010 so they fight and shanay beats lia up, and mike just sits and laugh at both of them, then goes home with shanay, but he's with lia the next morning driving her car around the city. can some help me im friends with both of these girls i dont say what the other one said about the other but how can i help them?