Hero connotes infallibility. NOBODY is infallible.
Examine this person. Why did he/she (probably he, so I’ll just use that) become your hero? What trait of his caused the admiration? Is this trait still present in him and able to be learned from, or does this let-down spoil your ability to gain? If you feel that you are able to be like Rabbi Meir Baal HaNes (and many people aren’t) and eat the pomegranate and throw away the rind, then perhaps attempt that.
If this person had one trait that you admired and because of that you began to hero-worship this person, that isn’t necessarily the best idea. Every person has good points and bad points. Admire each person for their strengths, and don’t assume that every person with a strength you admire is also admirable in every way (though I understand that you figured this out already).
Don’t let this stop you from trusting people. Just be discriminating in how you look up to people and why.
(This is, obviously, all general advice given without knowledge of the situation…)