When you remove someone from a GC, it is the same as if they had never been on the list. If the person was removed at or near the top of the list, they may have gone to another GC in which case their status would also be removed.
No, they will not know you’ve removed them from the group.
To rejoin a group chat on messenger, go to the “People” tab in the left-hand menu and click on “Chats.” Once you’re there, click on the group chat that you want to join. If you have a message from this group chat already, it will be at the top of your screen. If not, click “New Message” and type in a message.
When you delete a group chat on Imessage, the messages in the chat are deleted. This means that if you’re still in the group chat, your messages will also be deleted.
