Well, Maypole, some people say that 90% of marriage breakups are caused by money problems. I am not sure how they explain those divorces caused by adultery. By the way I heard in 75% of all marriages at least one partner had been unfaithful, but I am sure that is not so in your case.
I do not see why this should be a problem if you both love each other. Money does not always keep couples together, just look at the way celebrity couples break up at the drop of a hat. Can only finish with the Beatles song "Can't buy me love" which goes "I don't care too much for money coz money can't buy me love".
Hope it all works out for you both.