My husband is obsessed with Destiny’s Child, and it’s ruining our marriage

Last year, my husband discovered Destiny’s Child. I don’t know how he wasn’t aware of them before, but that’s beside the point. He obviously didn’t have this obsession before we were married. In fact, we have been married for 7 years, and he’d never exhibited any signs of obsessive behavior before this. Now, his obsession is taking over both of our lives and costing us a lot of money. He spends all day on eBay bidding on Destiny’s Child merch. He is always the highest bidder, so it’s very expensive. He is only subscribed to streaming services so he can listen to them. He bought a Bluetooth shower speaker so he can listen to them while he bathes. We cannot have one conversation without him saying something like, “You know, this actually reminds me of a Destiny’s Child lyric.” He’s spent hours watching YouTube tutorials, learning the choreography from every video. He makes me sit down and watch him dance in front of the TV to make sure his form and timing are perfect. He emails the members often, begging them for a reunion tour. He has also sent them birthday gifts in the mail. I would like to point out that his obsession is not sexual in any way— he just thinks they’re really cool. I’m almost to my wit’s end. I feel like I can’t escape Destiny’s Child and have lost my husband completely to this obsession. Any advice would be greatly appreciated.