No, this is not something that I would mention to him. It's natural to have crushes on other people, but they're only worth mentioning if they are something more than a crush and might possibly get in the way of your existing relationship. Why get your guy concerned over nothing?..

nooooo...oh my.. of course not. Believe it or not, you wouldnt want to hear him say he has a crush on another girl. you only think you dont mind now because you feel that way about someone else too.... ..
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but if he doesnt have a crush on anyone else and only cares about you, it might hurt hs feelings to hear someone else has been on your mind lately...
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so over all...just consider where your going to take this "crush" thing. if no where, then keep it to your self. but if you think maybe you want a relationship with this "crush" guy, then consider breaking up with your current bf first...