How do you know when your boss may be interested in you?

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I mean romantically interested in you. This is a married man. We have mutual interest. I have worked for him for 4 years now. I see him as a father figure. We have lunch together at least once every other week. The beginning of our conversations is business related but he takes it to a personal level. I tend to blow it off or try changing the subject. If I do say anthing personal I talk about my daughter. He use to say some things to me but I would pretend not to hear him. He has stopped saying things but every now and then he would slide something in. Can someone help or am I being paranoid? Please help. I don't want to ruin our strong, working relationship.