I could go on for days about dream analysis and unnecessary psychotherapy.. But I'd say yes, it's very possible your ex was a "stand in" for the house manager in your dream, or more likely that your house manager was a stand in for your ex in your subconscious. And that even beneath that.. the dynamics with your ex were most likely a replication of a role you were forced to unfairly play by an authority figure in your childhood.
I don't think it's always necessary to dig into the details, but just being aware of the underlying pattern is often enough to be able to more easily avoid it in the future.