Is it okay to miss your ex-boyfriend/girlfriend ??

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I'd like to know if it's okay to miss your ex-bf/gf when you're already in a new relationship. It's not like you still have feelings for them, it's just that you miss someone who was with you everyday back then, he/she screwed up and you forgave and forgot eventually. You miss the person's presence in your life, but it doesn't mean you wanna be with him/her. But will your current lover get mad if he/she finds out?