Legal Question in Technology Law in Texas

Based on only what you've told, it is not legal for him to do what he is doing. The legal name for it, in general, is "invastion of privacy," which is a civil remedy (in other words, you sue in civil court and try to win "damages" - legal name for money). To "press charges" against him, that is, to bring a criminal charge against him, you might file for "criminal tresspass." Much more information would have to be gathered, from you and other sources, before any sort of definitive, concrete answers could be given to you.