Unfortunately, some men seem to feel that a vagina should have no taste or
smell, or should smell like roses and taste like candy. The reality is that the
vagina (just like the penis) has a natural odor. Luckily, many men find this
smell arousing -- unfortunately, your boyfriend does not.
What I would NOT recommend is trying to cover up the smell and taste by using
deodorant sprays or douching. These don't really do anything other than cause
health problems. About the only reasonable thing to do is to engage in good
hygiene, wash the external genitals thoroughly and wear underwear that can
breathe. You might even suggest that the two of you take a shower together as
a foreplay to sex. The odor of the vagina (unless you have a yeast infection or
other illness) will be almost completely eliminated just by bathing.
You could also recommend two tips to your boyfriend: First, fill his mouth with
his own saliva before going down on you. As his saliva mixes with your natural
lubrication, it will taste and smell much less to him; and second, tell him to
concentrate on the top part, close to the clitoris.
I would suspect that despite his objections, he is still expecting oral sex
from you. You might want to point out to him that you probably did not enjoy
fellatio as much when you first tried it. Oral sex can be an acquired taste,
but reciprocity is only fair. He wouldn't want you to stop, now would he? :)