need advice!

my husband and I work together so we spend a lot of time together but it's been this way for about 5 years. But lately we have just been so distant, being that we are together so much I feel so apart from him. I mean we go about a week without even a simple peck on the cheek. and our sex life is rather sad lately. anytime I try to talk to him about it he just gets angry and we fight and get no where. I don't know what to think anymore. I'm do confused and desperate.