Myrtle is Moaning Myrtle's first name.

Harry didn't dislike Moaning Myrtle but they weren't extremely close friends.

Moaning Myrtle is a real character in the series, but she does not exist in real life.

Moaning Myrtle is a ghost who haunts the girls bathroom on the second floor - where she died after looking into the eyes of the Basilisk.

If anybody was in love with Moaning Myrtle, it was never mentioned in the books. When she was alive, Myrtle was bullied and never made any friends.

if you mean moaning myrtle, she was killed by looking at the basilisk