SO with poor hygiene

My SO does not shower or brush his teeth every day. We've fought about it multiple times already, and the last time we fought about it he apologized and said he would try harder. Things were going pretty good, but he recently started foregoing nightly showers again. It is really grossing me out and all he focuses on is how defensive he gets and the fact that I "tell him what to do all the time." We barely kiss or have sex anymore, I truly don't know what more to do. I don't need to hear comments like, "why are you with him?" I'm trying to get advice on the next step to take from women who have dealt with similar situations. Please and thank you.