Have you ever been completely surprised by someone's crush on you/love for you?

Whether it’s a friend, acquaintance, or anyone—have you ever discovered that you were completely oblivious to an individual’s romantic feelings for you? And in those situations, why do you think you couldn’t see the signs? Could you see it in hindsight after finding out? Also, how did you find out?

(I think there’s definitely people who are really obvious with their feelings, and then in contrast, there are types of people who are good at hiding things, or there situations that call for you to hide your feelings, making it difficult to tell. Unrequited love or crushes interest me. So that’s my reason for asking. Thanks!)