Hi Gwen,
Finances are a touchy subject even for happily married couples. In any case, it needs to be addressed. Just tell him you are concerned that the house payment is late and your account is overdrawn and is there anything you can do to help. Men seem to tie a lot of self worth into this subject so you want to be careful not to make him feel like a failure that cannot support his family. On the other hand, if he is being irresponsible and blowing money while on these "business trips" that might be a red flag.

Good luck, Mama