Should i stop talking to my husband?

My husband of 3n half years just told me he doesnt love me anymore on christmas eve hes been gone for a month now my mom and brother saw him with a girl in the frontseat of my car when i ask he said her bf was in the back,he does surrport my son and my self son isnt his hes from a former marriage,but he calls on a daily basis and wants to talk about what im doing and i should just move on dont think he had an affar but,never the less he still wants a divorce if i stop talking to him except when i need to will it help or hurt ?he always makes his calls short and sweet,always has something to do.i dont know what to do as he said he is filing for divorce in two days,i cant work cant get ssi cant and dont have family and friends to talk to so im stuck home alone all the time he has popsd that if i settle with him in the divorce he will pay 550.00 alimony until i get remarried but that is hardly enough to live on help please.