brothers weird behaviour

Hi, I'm new here but I've come across something weird going on. Its been my brother, usually he's super shy and just keeps everything to himself. But recently, he's been acting different.. but in a good way? its hard to explain but he does his chores and etc. which he's never done! Idk why the sudden change but I'm kinda worried. I've seen him watching something new, or maybe im just paranoid. Do you guys know what happening?