Dixie Normus

So, my boyfriend a little over 2 years took my laptop with him on a business trip and I'm using his computer. I wanted to post something on craigslist and I was searching for the right picture to upload on the ad. I came across a picture of a chick with a pierced tongue licking her pierced nipple. All you can really see is the bottom half of her face and some hair...but you can't really tell who it is. From the info I found out that it was emailed to him almost a year ago. However, there is a chick that he made friends with on WOW and they email each other every once and awhile. I truly believe that it is her. From her myspace picture...same hair and lot's of piercings. I've seen a couple of her emails to him over his shoulder. She has a stupid pet name for him. She says that she misses him (he doesn't play WOW anymore) and does those obnoxious <3 hearts and xoxos. What REALLY pisses me off is that the 'see you next Tuesday' knew that he had a girlfriend when she sent the picture! The only thing keeping from freaking the @!## out is the fact that she lives almost 800 miles away and she's married. But still.....that doesn't stop everybody. Is this cheating or a precursor to it or just harmless?

Basically, I know I have the right to be upset....but how upset.... Is this a big enough deal to go off on him when he gets home? I don't even know what to say. I'm in love with my boyfriend and I don't want to lose him, but I don't know how to deal with this. What if we get in a huge fight? We live together and I don't have anywhere to go and I'm unemployed and I don't have a car. If I lose him.....I will lose EVERYTHING. He gets home in 2 days. I would appreciate some help, especially a male perspective.