Can you blame a girl for falling when it was your whispered words and scorching touch that made her fall? (When you promised 'forever' and she blindly believed it to be the truth?) You put her on a pedestal, made her feel like a goddess, made her think of you as her soulmate.
You didn't tell her that soulmates are a fairytale and forever isn't as long as it seems, you didn't tell her that once you became her everything you were going to walk away. (And you didn't tell her that broken hearts don't heal.)