If she’s dating other guys, he’s not her “boyfriend.”
Maybe not. But there's nothing wrong with her putting him on the spot -- or vice-versa -- if one or the other is dragging their feet on a commitment. Maybe the guy (or girl) will realize that they really don't want to lose the other and make a commitment, or they'll just break up.
But I wouldn't fault a man or a woman who wasn't willing to wait indefinitely for the other person to make up their mind rather than be strung along forever.