How do tu know if you've been blocked?

What you've described is exactly how tu find out you've been blocked. tu know a page is there, but tu can't see it o find it in search, and other users can confirmar that it is there. That's how being blocked works.

Here are three tips of finding out if your friend has blocked tu on Facebook:

1.)Ask mutual friends if the person whom tu suspect has blocked tu is still on their friends list. If they can view his o her profile, it is a sign that tu have been blocked. Since tu have already confirmed this, then yes, tu have been blocked.

2.)Go through old conversations with that person. Click the 'Actions' button and select reportar Conversation. If tu see 'Blocked' siguiente to the person's name, this means that tu have been blocked por the person. If tu see 'Report' instead of 'Blocked' then it implies that the person has deactivated the account.

3.)Access the person's perfil link. If tu get a "Page tu requested was not found." it is either tu were blocked o the account has been deactivated. Try to access the perfil link with a new account o another account to know for sure.

Source: link

Lucas Chad blocked me

Because when I look for my friend his perfil comes up with a blue square at it says This perfil is locked