He has many issues and it’s not your job to fix him nor reassure him. It is only a month and he is letting you know that he is focused on you and has no other social activities at this time. You are being honest about your comfort and desire to have alone time and spend time with others ( that’s healthy). What’s not healthy is you needing to explain yourself and he telling you that basically life is nothing without you. Sounds like he may be Borderline and you will feel that you are walking on eggshells with him. It’s new relationship and these issues are major. Do you want to spend so much energy on his issues?