Husband question

So yesterday we starting to do the baby dance I was really into it and then all the sudden he just stops everything for no reason. Naturally I was completely upset I thought we were having fun and ttc. Idk what to do this is not the first time he's done this he completely shuts me out. I have spend thousands of dollars trying to get pregnant but what's the point it when it comes down to the fun part he dosnt hold up his end and at least try. Not to mention the complete humiliation I feel being rejected by someone who is supost to support me. Anyone have any advise I'm kinda at a breaking point