Yes, I think you should tell him that you believe only

married couple should live together, if that's what you believe. But it is never too late to let him know your thoughts about marriage and family.

My situation was different from your and many other MM's in this forum. When I met my hu*****and, I was almost 39 years old, while he was almost 41, we both had a fail marriage and have kid\kids from the previous marriage. So, we know what we need in our life. I think he made the best decision in his life for proposing to me, and I have never regretted to marry him. We have been married four and a half years already.