What is the Craze with the Multiverse

What is the craze with the multiverse? I'm going crazy! I see multiverse on everything these days. I don't know what's real and not real anymore. I don't believe in the multiverse. In fact, it scares me thinking of it. Does anyone else feel like this? I find the concept of the multiverse far more terrifying than the concept of ghosts or demons. I think because of the gravity of the concept. I don't like it.