Watching your dream become a reality must be a scary thing when the end result is negative. Your motivation to tell the lady is an understandable one. As you learnt, her portrayal of her life was false. She chose to leave her marriage - you were only the dreamer. Your dream resonated with her and she acted on it. Her actions are not your responsibility.
Oh that's a great way to look at it and I must say I feel more comfortable looking at it that way, as her actions are her own decision.