7 years ago, my GF came over to my house and left her password on my computer. I accidentally signed into her email account and read a message from her to her ex-boyfriend telling him that he was still on her mind, asking him if him being on her mind was good or bad. Then she told him not to contact her on MSN Messenger and shed tell him why later. Mind you, we had each other's messenger passwords but not each other emails passwords. Her password was saved in my computer.
When i asked her what was she thinking, she told me it was a test. And that she wanted to get back at me for chatting with female friends on the computer.
I broke up with her, and took her back.
I made it clear that i hate ex-boyfriends and that I hoped her ex-boyfriend dies slowly in a house fire. I apologize to you ex-boyfriends reading this but females have a tendancy to want their ex-boyfriends back. Especially after theyve been dumped and they broke up after he told her that the relationship was a seasonal fling. When i told her the evil things that came to mind (believe me they were pretty cruel)

His screen name popped up like ounce or twice on AIM but the end result is its deleted now.
Her EX-Boyfriend requested her on Facebook.
They have no mutual friends so Im wondering if he was stalking her.
I also wonder if they have other mediums of communications that i dont know about.
Just the other day, i found her playing a game on her iphone with her EX-Boyfriend. The game requires you to also have an Iphone why is she and her exboyfriend playing crossword puzzles together?

Im really starting to grow even more insecure about her... What do i do?