We got into a stupid argument, he has been gone for 6 days, we have a child together and he hasnt called, I am?

really starting to get upset. It is consuming my life, I dont know what to do. We always make up and break up, but this is the longest we have went without making up, I saw his car this morning parked up the street from my house, (usually when he gets angry and leaves, he will leave one of his vehicles at the house, but I told him to move it so he did, he also made me give him his money for half of a tv purchase), it was his because I saw something in it that confirmed, I got weak and called him and his phone is not in service, what should I do? His family hasnt even called to check on the baby. I saw his brother the other day and nearly lost it, please help, I am tired of feeling bad everytime he gets angry and leaves over something stupid.