When is closure not worth it

Me and my guy best friend have been intimate for 5 years now. We started dating first then started to become FWB. It was going well and we’ve always had an open communication but lately that has changed. He’s been acting weird and today I notice he took me off of snap. I’m genuinely confused Bc I didn’t do anything.

Should I text him and figure out what’s happening for mr own closure? Or is this all the closure I need and should I just move on ?