1) keep doing what you are doing. Why change now? You said yourself that you are happier.
2) make sure not to start pursuing now. That won't do you any good.
3) don't tell her things are "hard for you" to hear. Tell her she's being disrespectful telling you about her exploits with OM! It's not that she's hurting you....it's that she's not respecting you as a person!