It sounds like personally you are having issues, elsewhere rather than just the bedroom, which, in turn makes an issue in the bedroom!
I know, genitals dont always smell the most pleasant! But, there should be a proper conversation or a subtle hint first.
Me and my DP have been together over 5 years, i know, when i was pregnant i had bacterial vaginosis and trust me, i could smell something was off! But DP still wanted to, and, still does! It's me who usually turns it down now due to baby and being hella tired.
That doesn't sound like an attempt to try and resolve a situation but, in fact hurt you amd seem like you are the problem when infact you arent.
Every relationship is different, did you originally have lots of sex? Passionate? Have things recently gone downhill? Any other reasoning behind it?
Personally, if i spoke to my DP and said 'look, im unhappy with our sex life, or generally unhappy, what can we do to chamge it' and my DP ignored it, I'd be out, especially after what seems like a while you have been trying to resolve things.
A real relationship is about communication, trust and a need for intimacy. Which seems, you arent getting any of those.
I say, talk to him once more, have a idea of what you want before this chat, sit down, say your feelings. If he dismisses you again, I'd personally be leaving and saying i want a divorce and no more am i being treated like this.
You deserve happiness, love, affection and if sex is what you desire, sex! You are entitled to all of those, just, because you are married doesnt mean you have to subject yourself to this.
I really hope that you can sit and work things out, but, if not, you have to understand that you are a great person, worthy of finding the correct love for you.
Just because this marriage may fail, doesn't mean you'll never find it in someone else