How do आप know if you've been blocked?

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

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

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

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

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

Source: link

Lucas Chad blocked me

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