Asking Eric: Her ex has been pining for her for 15 years. She wonders what his wife thinks of this

Dear Eric: My married ex-boyfriend from more than 15 years ago is still in love with me. Through the grapevine, I have heard he still talks about me and even tries to bump into me in public. He is always asking about my whereabouts. I feel very badly for his wife. If she knows about this, certainly it must strain her marriage. If she is in the dark, surely, I hope someone will enlighten her and perhaps she can get him to knock it off. I’m perturbed.