Spouse filed HOH and claims kids, how do I file?

My spouse and I have come to the realization that he makes the most money, so it only makes sense that he files head of household and claims both, only 2, of our children. We are not legally married as of yet. However, we both live together for the entire year. How am I supposed to file? I know I'm supposed to file single, but I'm confused on the dependents part. I should not claim the children correct? And I would imagine he files with four dependents?