Should i be upset or jealous that my boyfriend called another girl beautiful?

[Clarissa]

I was on facebook reading statuses and I saw my boyfriend commented on some girls photo that he had just become friends with on facebook. I was curious to what he said so I went onto the photo. He said u r so beautiful. I was really upset but then I thought about it and didn't know if I was over reacting. How should I talk to him about it so I feel comfortable telling him and he doesn't feel offended