My husband is very supportive.
However, whenever I'd get all worked up about eating better or losing weight, he never shared my enthusiasm....and he ALWAYS supports me. I found this odd, so I just asked him one night.
He told me that it was hard for him to act supportive and to encourage me when I'd done the same thing over and over and never made any kind of change. I'd "try" for 2 or 3 weeks, so no results, and stop. He was right.
Once I actually DID make a change, and he could see me trying regardless of situations that came up that would make it easy to quit, he has been amazing.
Now, I'm 10.5lbs down and not a day goes by where he doesn't mention something about how well I'm doing. He even dug out his old 10lb bowling ball from middle school to show me how much weight I lost...
Could it be that your BF just needs you to SHOW him that you're truly willing to do something? You don't NEED his support (althought it's nice to have) to do it. For me, showing my husband that I actually COULD do it was part of my drive.
as far as the money thing...yeah, it isn't healthy for either of you to look at the money as "his". Your job is to stay at home and take care of your child...that's what he wants you to do as well....but that doesn't mean he should be the only one that ever gets to spend any money. You should both have a say.