Does "Seen" means that the messages have been seen already? My friend says that she hasn't actually read my messages.
Yes, the "Sean" status indicates that your friend opened the message that you have sent. However, as you can see on the official web page, this status doesn't guarantee that your message has been read. I suggest you contact the Support team for further information. You can get in touch with them using [email protected] email address.
[email protected]