He is unsure now?!

So long story short. I have been with my fiancé for almost four years. It has had up and downs. We have two babies together and I have one from a previous relationship that calls him dad. My fiancé has been around since my oldest was 3 months old. Just back in April he proposed while I was 7 months pregnant. It was his own choice to do so. Fast forward to now (very end of October) he is unsure he wants to get married. He said the thought of marrying me doesn’t scare him but the thought of getting married does. I have this gut feeling that marriage with me isn’t what he wants at all. He is the type to do things out of feeling obligated. I asked him about when he proposed. He said he was scared because we were welcoming another baby and that’s what he wanted then and he was happy. I gave up my own place, my independence to move in with him and I rely on him. A part of me wants to run and get all that back because if after this long he doesn’t know then idk what will make him realize if it’s what he wants or not. Then other part of me wants to stay because I do love him and I’d do almost anything for this man but I also kinda know my worth.....idk just kinda hoping for advice I guess. Am I being crazy about this?