Secret Admirer No Longer A Secret Problemo?

First, to understand what action I would take, you must understand my stance on dating:

Dating is to find a spouse which I am not currently seeking.

I’ve recently been informed of a secret admirer, and have just now discovered the identity. Through a text. He’s shy, so I can understand that part. But I don’t know how to go about this sort of situation where one is attracted to another. I’ve done nothing to gain anyone’s attention, and have only spoken to him once or twice, and strictly on educational group work. How do I approach this guy and let him know I’m not romantically inclined to anyone?