Up coming wedding.. Or not.

Last year I was supposed to get married in July and my fiancé turned into a straight dick for several months before the wedding and ended up calling it off 2 months before it was supposed to happen. His entire attitude changed after he canceled it. He was happy and laughing all the time making jokes and really caring and sweet. 
This year in January HE found this wedding venue and decided that I could start planning again for our wedding. As soon as I paid for it his attitude changed again and he started turning back into an ass. Well we are supposed to be getting married in 5 weeks I've sent out the invitations, my mother and stepmom are planning my bridal shower. I have to make my last payment for the tables and chairs next weekend... This week he decides that he doesn't know if he wants to marry me. He thinks that if we do get married that it Will either be amazing or the worst decision he has ever made.... I have no idea what to do. Do I continue planning or just quit until he's made up his mind... Also I've paid for this entire wedding by myself. I'm a full time college student .. I just started working and I have 2 children (7,9) that call him daddy. im not from the state we live in so if he leaves I'm out of a place to go.. I feel crushed and I really have no idea what I'm supposed to do.