It is sad to hear another relationship has gone awry. As helcat said, this kind of behavior seems normal in today’s social climate. It is a way for couples to be more intimate. But, you have your preferences. Nothing wrong with that. You two are just not compatible. You have made your decision based on knowing you two will not be right for each other. You just  need to stick to it. Separation  is difficult for anyone. More so if there was felt a connection by one of the two. Give it time. Just stop responding. It sounds cruel. But it is more cruel to continue this way.