Yes, what are your expectations about texting? How often and at what times are you doing so? Is it always appropriate? (ie. when he is at work or a function?). This could not be an indication of his feelings for you at all.

You need to sit down with him and have a discussion about expectations regarding communication. Is texting even something he wishes to do? Perhaps there are times for him it isn't a good time. Perhaps he just isn't a texter (I never respond to a text unless it is a question or requires a response and certainly don't expect an immediate reply either). Personally, if someone wants a conversation with me I expect a phone call. He might have his own views on the subject.