Is it normal that my Dad is starting to date a year after my mom passed away?

My Dad called me today to tell me he doesn’t want me getting mad but he is going to start dating again? I was a little thrown off by this but I told him it’s his life do what you want to do. After I hung up with him I felt numb and felt bad for my Mom and felt like he is a selfish person as to why so soon would you even consider dating? I know we have wants and needs in life but a year after losing his wife? Am I wrong to feel this way?
Is it normal that my Dad is starting to date a year after my mom passed away?
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