How do you treat something casual?

How do you treat something casual? I’ve been seeing this guy for little over a month. We talked and he said he’s not in a place to commit or be anything serious. I agreed to casual bc I do enjoy our times together. Now my issue is things don’t read casual to me. He’s romantic, tells me he misses me, we talk for hours on end about various topics, and sex is always passionate. We share traumas and details. When we’re together we want to be close as possible. Everything physically and emotionally is very intimate. I’ve not had someone be casual and feel connected. It’s making it hard for me. I feel like if he sleeps with another person I’m going to feel bad and hollow. I just wonder why make things feel so intense? We’ve been sleeping together, so if it’s a ploy I don’t get it. I thought casual would be a bit more cold and easy. I agreed to a date with another person today. I’m gonna cancel because I just am not in the headspace where I’d enjoy it . My feelings just are connected to the guy I’ve been seeing. I know mentally I have every right to see this other guy but I can’t do it.