Looking to get health insurance for myself and my significant other…

I am looking to get insurance for 2 people; myself and my significant other. We are not married, but we live under the same roof and he a student and my dependent financially. I have claimed him on my taes for the last 2 years and I am his sole support. So my question is are able to purchase insurance together as spouses or are we required to purchase separately? I would prefer one bill that is why I am asking.