Hey there, just want to gently say that someone older than you in your family should be getting support from their own friends/people their age. They go to nieces/nephews/younger adults and kids for emotional support because they want to extract validation that's not fair to you. And if he seems fixated on you and demands you text him a lot that is controlling and inappropriate at best, potentially creepy at worst. He is grown, he does not need you and should not be expecting so much from a younger relation, even if you're an adult. You should be spending your emotional energy on your own life. I played this game with various aunts and my parents and my parents' friends for years and it took me a while to realize how fucked up certain things were. His problems are not your problems, your life and your time belong to you, you never have to reply to anyone ever, he is old enough to manage upset feelings without you.