How can you see a blocked facebook profile?

[GirlGamer]

Me and my boyfriend ended on bad terms so I blocked him and his friends on facebook as I wanted to end all contact with him.
I've not gotten round to changing my phone number yet, so he just text me and described photos and wall posts from over a year ago, and I can't understand how he can view any of it.

My profile is totally private, he is blocked, his friends and family have been blocked- to avoid a situation like this.

Can anyone suggest how he can see these things and how I can prevent it?

[Jennifer]

Someone is either telling him, he made a new account, or he hacked yours.

[M]

When you block someone, you and that person don't exist to each other on Facebook. So he's probably looking at your account through another person's account or just remembers what you've posted in the past.