hay ladies help please

i just had my baby 2 weeks ago , everything started when i was in the delivery room , a girl sent my husband a message on fb telling him that i was cheating on him with her bf , well she sent him some instagram screen shoots with some messages, i know this guy for more than 7 years he always start making comments like hey beautiful i wanna see you come see me i miss you , things like that and i always change the conversation , in one message i remember i wrote i miss you too and i can't wait to have my baby so i can go see you , i know it was not good so i stoped texting him , the truth is that we were not talking for more than 5 years. At the moment when i decided to text him again was when i discover that my husband was trying to cheat on me again with a waitress he meet weeks before , but i didn't cheat on him like he is seeing the things now he is calling me names etc and i don't know what to do