If he didn't text you for a week, and this was your first knowledge of absent communication, it sounds like he ghosted you first. But if you also accidentally ghosted him or forgot about him and didn't mean to, you can state this and briefly apologize. You do not have to blame yourself for talking to other guys. Unless you are in a relationship with someone, talking to more potential boyfriends is a good idea. This gives you a wider pool of dating material that helps you find the right person. Men should generally also text first or do the chasing, so I would not worry about your inaction unless you did not get back to him in a timely manner when he communicated with you.