Being in a rather close relationship with Remus behind the back of your brother, James, was nice, at first. Then more and more time passed, and it didn't seem to be a right time to tell this to your brother - you know too well the kind of tantrum James would throw if he found out that his sister and a close friend had been seeing each other for over three years behind his back
But, of course, he found out anyway.
"They're in love with someone and she won't tell me!" James' outrage can probably be heard throughout Hogwarts. "Remus, will you at least do something about her?" he almost whimperingly addresses his friend.
"I surely will do," Remus with a squint only you can understand, snickers. It all amuses him, like he's not involved in any of this. "And rightly so. Why don't you tell your brother?" crossing his arms under his chest he looks at you with a raised eyebrow, James is about to open his mouth but is interrupted.
"Why are you like vultures around them?" only Peter comes to your defense. He's charming in his ignorance