Losing Hope

I've been married for 3 yrs now. We have a beautiful baby boy who is 3. We were trying to have another child, and then alot of things changed. Right now, my husband has no idea if he wants to stay woth me or not. I've done everything i possibly can to fix us, but now, i am losing faith that we will get through this. He wanted another child so badly. And for some reason, its not happening for us. Most of the ppl i know arent married and yes i got married young, but i believed that GOD was on our side. the devil has been so busy in our marriage. i dont know what else ro do but to ask for advice on how to save my marriage.