If you don't have him blocked, then he might be able to see you...it all depends on your security settings. You can set it to show your profile to "friends only". If you block him, he will no longer be able to see your profile at all, and it won't come up in fb searches if he is logged in and searches you. Wierd how guys react to women they used to date. I have three of my ex gfs on my page, mostly because we're all older and we meant something to one another at a point in our lives...and we were all friends before we were much more.