Is it normal to think about your ex while in a relationship?
Mostly.Normal for most people
Yes, it’s normal to think about an ex sometimes while you’re in a relationship. A passing thought doesn’t mean you want your ex back or care less about your current partner.
Exes are part of your memories, so a song, place, or random reminder can bring one to mind. Lots of people have the occasional thought without it meaning anything deeper.
It may be worth paying attention if you’re thinking about your ex constantly, comparing your partner to them, or wishing you were still together. That doesn’t automatically mean your current relationship is doomed, but it could point to unresolved feelings or something you want to understand better.