Silently dying inside!

Recently moved in with my significant other, now fiancé, dating and engaged in less than a year. Before moving in I was living on my own with my child, autonomy to life freely and come/go as I please felt liberating! Moved in only to pay $250 less in rent than I was when I was living on my own, granted he covers bills and I cover all groceries which is almost $800-$1k a month on top of rent. Started a new job recently and now he’s suggesting I carry his child on my insurance. We aren’t even married yet and I feel like I’m carrying a lot financially and doing a lot more now than I was when I was living on my own. No telling what he does with the rent that I pay him each month, he of course owns his home and refuses to sell and get a home that ours, states that he likes being mortgage free and low on taxes. I don’t know how to communicate my feelings about everything and it’s causing some resentment and questioning of my relationship. Just feel like he’s benefiting so much from me in less than a year of fully knowing this person.