He didn’t believe her in just being nice to Ginny. He knew before that she didn’t mind hanging out with her when she had stayed at the Weasleys. Very aware that she was no by means friends with the red head. But it did make him curious on what she was planning. Hermione didn’t do things on a whim, she always planned it out and anticipated. She had a reason for doing this and he couldn’t figure out what it could be.