Leo is listening to you vent about your friends, hearing you fear they don't like you anymore or that they find you annoying. He knows you're stressed, can see how close you are to a breaking point. That's why he's here, to help you. To be the prince charming in your story.

So as Leo innocently listens to you, he subtly admired your face, not the least bit sorry for threatening your friends to stay away from you. You're his best friend, he just wants more of your time, is all.