you did something to him to have him block your facebook account....
a long lost relative uncle doens't just report your account to facebook for no reason if you get my drift.... I know a lot of people that change their name on FB because their stuff on there is 'unprofessional' and I'm like - dude - all you have to do is reject friend requests, put all info on private/only friends/only me- and start a FB Page with your professional persona.
Fucking every celebrity, TV personality, radio host, you name it - does it jesus christ it is not that difficult. You can have an actual Facebook personal page that nobody ever sees except you, with all the otherworldly compromising bullshit you've ever done - and a cleaned up Page with your persona where professional contacts can reach you.
My FB is set to only friends of friends can find me, all my pics are set to only me nad I don't ever share anything where I am tagged by somebody else or what not to my timeline.
Result is that randoms can't friend me on FB, and my profile is for me and a few friends and that's it.....
In fact if somebody I work with friend requests me (if they somehow find me) - I say no. Plain as day. I message them and tell them FB is just for friends and family.