Not really. All I can only say is that it's natural for men to
want to look at beautiful women. I believe your bf loves you alot,
but he has these biological urges to let his eyes wander. It's not
something he has too much control over.
I take it that you are still quite young and so don't have alot of
experiences in BGR? Take it easy, talk to him about it if you
seriously feel that it will affect your relationship drastically.
At the end of the day, try to be confident and trusting.