Girlfriend deleted message from another guy, how would you react to this situation?

Anonymous
I started dating a girl last year in June of 2010. I'm still dating her to the present day (10 months later). Recently a guy she met in March of 2010, before she met me, has shown back up in her life. Apparently, she started talking to him in March and stop talking to him in June when she started dating me. The stopped all form of contact. Over the past ten months she has changed her phone number. Well recently he showed up at her job. (shes a bartender) She gave him her new phone number not only that but also gave his friend her phone number. I stopped into her job that night and she made it clear that I was her boyfriend. Later that night she came over to sleep. We have an open cellphone policy in front of each other. She went through mine the other day so I went through hers this night. I come to find out she deleted 4 messages from this kids friend.

What would you be thinking in this situation?

Also, let it be known that she is suppose to be moving in with me to a new apartment. This guy and his friend just so happen to be from the same town.
Girlfriend deleted message from another guy, how would you react to this situation?
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