cant belive this

My boyfriend has decided that it would be better for us to break up.  We live together, I have a daughter that thinks of him as dad.  We both left our homes and moved into this home together with the intention of getting married.  Lately he is very edgy and moody.  He is mad everyother day for something very petty.  He will not go to counceling and he won't even talk about it.  I feel like he stopped loving me.  I just wish I knew what happened.  I don't know what to do.  I have to find a new place to live and try to get over my broken heart.  I know once I leave that is the end.  I am scared and so sad.