Watching that last episode always takes more of an effort for me. I do the same with video games and books. I'll find myself avoiding them when I'm close to the end so that I don't finish it up. I've been making an effort to finish series lately though. There's always a new one I'll get obsessed with around the corner so I try to complete the old one. I still need to watch the last episode of The Orville though. Also trying to push myself to finish up The Last of US 2.