I don't think it's possible to tell someone that they already know everything about them. Everyone has so many depth of  layers explaining why they are the way they are. I also, think it's impossible to get bored of getting to know someone because quite frankly, everyone's always changing, new stories add into their memories every day even if it's a short story and i feel like there's always something new to learn about someone. You can get bored of someone because of the things you guys do together or because of characteristics of theirs that doesn't mend well with yours but getting to know them? Never. As i said before, i love getting to know people, gives me a better taste in humanity. So i rather never hear, "There's not much to say, you already know everything about me." Because it's not true.