My friend not yet answer request as a friend but why i can see they activity in my home page?

Until now my friend not answer my request as a friend, but yesterday i show my friend activity join in some group in my home page. When i try to open he's facebook or profil, i can't coz he's not yet become my friend. How it was happened?
Are my facebook already unsafe? Are they can see all my privacy which one im setting only for friend? What i must to do? Pls answer my question soon because im worried about my facebook secure.

Regard
Desy

If you have a pending friend request with a friend, you'll see some of his activity on your homepage. Don't worry, it's normal!

Thanks bro/sist for ur quick answer. I just worried about my facebook secure.