How to find if a Blocker on Facebook is online?

[Theresa]

My ex-boyfriend (I'm glad he's an EX) has blocked me on Fbk bcuz of a terrible past issues between us. Anyways, he has blocked me on Fbk. The only thing is, I still have messages between him & I. When I go into my "Archive" folder, I can still find the conversations between us. Even so, there is a green dot next to his name like he's online or, sometimes there is a phone symbol like he's on his phone. Then too, I've tried searching his name many times & many ways, still unable to find him. So, is there a way to find if he's really online?