Is it normal that I pretend my boyfriend is someone else in bed?

My ex boyfriend told me that if I didn't say his name during sex, he always thought I was thinking of someone else, or he wanted to be sure that I was thinking of him. Little did he know, I was saying his name just to make him happy, but still thinking about someone else. Then I realized how stupid it all was and dumped him for his needy insecurities/jealousy/possessiveness/obsessiveness/stalkerness/etc