Secretly? Ha. I don't keep secrets well, and I've always worn my heart on my sleeve.
Falling for someone I shouldn't have, absolutely. That's just how it goes. I have some regrets about some of my adolescent crushes, but none at all about the ones from college on. Even when it has complicated things that should have been simple, I don't regret loving good people.
I'm usually very quick to admit my feelings. I don't regret that either. I sometimes regret how it happens, or what happens afterward, but not being open and honest. And I've learned that how someone reacts to the information tells quite a bit about what sort of person they are.