No, you are not silly at all. We as women are generally much more in tune with the need for verbal communication and connection.
But a man that wants to connect with you will do so. Rather than thinking of this as an affront to your desirability (which it is not), try to think of his action/inaction just as an expression of his free will. Although you might like him, looking at the situation objectively will help you navigate the muddy waters of online dating and its frequent lack of follow-up.
It is so common to infrequently or never hear from someone again when online dating. There are so few people truly meant for us, that most people you meet online will not be your match and their attention will fade away. When someone is truly your match you will both feel it and the man's actions will tell you he feels it too.
So unless a man really shows you he likes you, think of him as another ship passing in the night.