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The concept of loyalty in relationships (friendships, work, romantic whatever) is absolutely dying in American culture. What your boyfriend is doing is wrong, rude and inconsiderate-- there is no denying that. For the guys posting on here acting like it's no big deal, I wonder how they'd feel if their girls were salivating over every hot guy on the street.
Fact of the matter is, guys these days have less and less incentive to be loyal because they can get a steady supply of sex from just about anywhere. Unfortunately, most guys raised in this toxic culture will do what he's doing. Either he is doing it on purpose to
1) trigger you to break up with him, bc he's cheating/ not feeling the relationship and doesn't have the balls to do it himself
2) he's a douche
You need to decide for yourself if the benefits of the relationship outweight this annoying habit, but realize many guys are unfortunately like this