My husband wants a motorcycle when we cant afford it and is bein such an *** about it help!?

My husband keeps whining about getting a motorcycle constantly when we have 3 children, one on the way, student loans, unpaid medical bills, and other debt. We live in a mobile home and I think its way more important to pay off our other bills and get a house for our big family. He constantly is being an to me bc he doesn thave a bike. He never wanted one til his brother got one cuz his wife put a mortgage on the house that she had owned free and clear because of a car accident settlement. I feel like my husband is being selfish and unfair. I can understand he wants a bike, but why is he acting like this. He has even gone to the bike shop and has filled out papers to try to get a loan. they turned him down but said he could get a loan with a co signer. his parents agree to cosign a loan for his sorry a** to have a motorcycle (because his dad and bro prob have one and they can go ridin together) but what we really need is a house to accomodate our children...but of course his parents wont cosign for that. That is so messed up if u ask me. How do I deal with him bein an a** about this whole motorcycle and not caring about ne thing else...and what do i do?!