How can I possibly move on from this?

Had a long term fwb. It really started as us dating but after while when I realized he had no interest in a relationship I settled for a s*x buddy. He’s an entrepreneur so he’s often busy and traveling so originally he said he had no time for one but then he was home a lot more after a year. We linked not all the time. Maybe twice a month majority of the time. Sometimes more sometimes less. And there was a couple of times we went like 3 months without even speaking. This has been over the last three years. It’s been hard for me ending things. Things picked up a lot in the past few months and we had been seeing and talking to eachother more. But in the back of my mind I knew he still didn’t want anything more. He has always known how I felt and what I wanted so I have communicated to him. He just doesn’t say much in return. I know it was stupid to stick around that long so no need for anyone to make me feel worse about that. A week ago I simply told him by text that I didn’t want to do this anymore. He said okay instantly and hadn’t heard from him since. Which I’m okay with. I mean if someone ends it with me I probably wouldn’t give them the satisfaction of a worrisome response asking why and stuff. Especially if I already know why. He definitely knows why. I know in my heart that i made the right choice. He has told me in so many ways that he doesn’t want me other than sexually. But I really really really want to talk to him and see him. It’s taking everything in me to not message him right now. So I think I need some tough love here so gentlemen go ahead tell me that I need to suck this up and move on and to stop being stupid please.