It may be possible to fall out of love with your boss, but only if you can change your existing passionate feelings into passionately NEGATIVE feelings--and that's not a good bet at all. But it's more likely that you'll need to take the pay cut, because he's using the money to keep you in his possession. One way to fall out of love is to explore your legal avenues to suing him for sexual harassment, since that's what he's doing, and perhaps his wife doesn't like it. How long did the prior physical relationship go on with his wife involved? Is it possible that THEY were using you to keep their marriage from breaking apart by giving him a way to have his stable marriage and "sow his wild oats" at the same time? Does his wife know he's still using you to keep himself excited?
You're actually NOT stupid or nuts at all. Love & sex are emotional powers that rationality can't squash at all.