This guy was my facebook friend before he got me really mad and I deleted him. Now he sent me messages in another app and I felt like we still needed to talk. So I sent him a message on facebook and I think he never got that. No "Seen" in the right corner and no reply... so is it possible he hasn't got my message?
Most Helpful Guy
Probably gone in the "Other" section of the messages on Facebook. Nobody really bothers to check that1
Most Helpful Girl
It's possible. Sometimes they go into a separate folder called something like 'Message requests', I've had people I know but aren't friends with on facebook message me, had it go into that box and not been notified of it. The person was in the same lecture hall as me and came up to me at the end asking if I got their message and I was like '? No?' and they showed me the message request box.1