He liked me and now doesn’t? Should I move on?

This guy I like used to show mixed signals that he liked me. I have watched his young son many times for him and his son adores me and sees me as a mother figure. I think he sees it as well and I’m trying to show him that I’m there for the both of them. He just keeps it to business only. He doesn’t even smile or laugh. I’m thinking it’s time to move on but I don’t know.
He liked me and now doesn’t? Should I move on?
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