Right now, extremely creepy, at least from an american standpoint. Hard to agree or disagree from an international one. I will agree that it seems too early for a girl to be emotionally mature enough especially preteen to be truly in love.
Things people have to consider.
1. Are the parents okay with it?
2. If at this point everything is above board and gentlemanly and non-sexual, then there is no reason to prohibit it.
3. If he let's her grow up and helps her mature and find her path in life, then this isn't a bad thing.
4. But yeah, if its comes strange creepy sexual thing, then its gotta stop.