Wonder about your ex?

I’m married have been for the past 6yrs and have two beautiful kids. Is it wrong that sometimes I think about my ex and wonder if he’s happy? Him and I dated for 5 yrs and was my only serious relationship before my husband! I honestly thought we were going to get married, however we needed our relationship and decided to cut out all communication. With my husband we only dated for a year and he proposed and got married within 2 years of dating. I’m happy with the family we have and I love them soooo much I wouldn’t trade it for anything in the world because they are my world! but once in a while I wonder if my ex is happy, wonder how his life is. Wonder how my life would have been if we got married as we talked about our future. Is this normal? Have you guys ever wonder that? Am I wrong to be wondering that?