This isn't a bike question but a marriage issue. We are being asked to take sides in dispute between husband and wife. Nobody here can referee a relationship between husband and wife.
Carbon fiber holds up with plenty of burly men riding them hard but that doesn't change a thing about this issue. Whether it was too much money and why your husband is angry is something you have to work out with your husband.
I'm going to give this advice/opinion - there is no such thing as "my money" and "his money" in marriage. Marriage is either a 100% union where we put the other before self or it isn't a marriage.
I hope things work out.
-Tim-