Most Helpful Girl
She sounds like she's just flaky and insecure. I know that sounds mean, but I'm not going to sugar-coat it. The thing with the phone and tissue was a bit ridiculous. You need to have trust in a relationship and if that's the only time anything like that has ever happened, she should have had no problem understanding that it's a family friend. It's great that you trusted her to have your password, but she shouldn't feel the need to have it anyway!
As for cheating and leaving, she clearly is a bit of a flake. The thing about not feeling safe sounds like an excuse to me. She just was insecure and probably didn't know what she wanted. Which isn't fair to you.
sorry that happened to you, but honestly, you're probably better off without her!
Most Helpful Guy
1st... let me say this there are no good reasons to cheat... period...
if she felt unsafe in the relationship she should have communicated that to you.. before going out and cheating... besides to have revenge cheating puts you on the same level as the cheater.. i'm assuming that you never cheated on her... and at times some will use cheating as a way of getting out of a relationship they no longer wanted to be in... it sounds as though also she was looking for things to accuse you of cheating... and at times when some one accusses another of cheating its them that's doing the cheating...
who knows she could have been cheating on you for some time and used this as an excuse... just food for thought.