Boyfriends Co-worker email him!

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Ok to make a long story short! my boyfriend has informed me that a girl from work has been emailing him ! I found out from him that she gets around alot and that she wants him ! I have told him that i don't like her emailing him ! but he keeps hiding the emails ! Or at least trying to because i know my computer very well I can find anything on it! They are not bad emails but just the fact that he his trying to hide them from me and that she has a thing for him and knows about me and our daughter really diggs at me ! what should I do????