1. I think she feels guilty
2. I think its due to family pressure that cos her to change and she knew abt it but had to conform.
3. You changed or decided to relief yourself with friends. Hence to her it might be considered eating outside.
4. No matter what u do abt this subject, it'll never go away till either one of u admits it and grow numb when either party rises it up. To me thats forgive n forget. Sadly the forgiven part nvr takes place.
5. Lastly, i think the issue isnt that single one. Perhaps its payback from her end cos you created 'hell' n didnt let her experience the new guy.
To end: steven hawkins the wheel chair bound physic prof said women is the greatest mystery in the universe. If the brainest guy said so, what can us simpleton do to outperform him.