Is it normal to miss your ex after a mutual breakup?

I’ve never had a real breakup before because my ex is the only guy I’ve had a relationship with. We were together for 8 years, knew each other for 10. He was a huge part of my life and the father to my child so we’ll never really cut ties completely. I just feel shitty because I know we made the right decisions to split, but I do miss him so much. Trying not to get too caught up in the emotion but it’s hard