Really?
Sounds like an escape to me; you: 'I've a crush on you', she: 'sorry, I'm a lesbian'...
Why didn't this secret show up BEFORE you declared your love?

Because it's none of his business?

Yeah, but "Long standing Crush" indicates they've known each other for a long time. And if they've known each other that long, it's a little strange he didn't know her sexual preferences by that point...even if just by seeing other people they've dated.

It only indicates that he’s had a crush on her for a long time. It doesn’t mean they know each other well.

He also never told her about his crush, so chances are conversation about relationships/orientation never really came up.

They were exchanging secrets.

a. He said it was his childhood crush. Sexual preferences in children are not always obvious and the questioning kid may not even be aware he or she is gay.
b. Do you think that you can always tell when someone is gay? The norms you think you know that represent the LGBTQ community are stereotypes. Not indicative of every LGBTQ person.

You drove her to the other team!

When someone responds to you that way, the best thing you can do is throw it right back at them: “Oh yeah?! Well, I’m gay, too; gayer than you. You wouldn’t believe how much dick I’ve sucked!”

Isn’t that from the movie “Game over man?”

At least she didn’t reject you because she thought there was something wrong with you.

Yeah OP, think how much worse it'd be if she saw your junk in the shower and commented on it.

I also have a thing for lesbians.

Lmfaooooooo 😂😂😂

I mean mabye but don't you think you would have had known she was or that if she was and it was a secret would have had said something different. mabye she is is but I doubt it and she probably doesnt like you.

Give her my number XD

Damn didn’t see that coming

Tell her my girl got a girlfriend