When a guy calls you beautiful, but has a girlfriend is he sincere?

I know a guy who is probably one of the smartest, good looking, genuine kind of guys. I don't know him well, in fact I probably know his girlfriend better than I know him. One day I saw her and we chatted, I told her when she said she was dating him that I thought he was a really nice guy. She said " thank you, I think so" and a few days later he wrote me calling me "beautiful" and I wondered if e meant it or just said it because she told him what I said. I could only wish that they weren't together...and he was my boo :p but I'm very happy if he's happy. :)

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When a guy calls you beautiful, but has a girlfriend is he sincere?
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