Is it normal to check people out while in a relationship?
Mostly.Normal for most people
Yes, it’s normal to notice or find other people attractive while you’re in a relationship. What counts as respectful “checking someone out” depends on your partner’s boundaries and how you act on it.
Being in a relationship doesn’t switch off your ability to notice attractive people. Plenty of people still glance, appreciate someone’s looks, and move on without it meaning they’re unhappy or looking to cheat.
There’s a difference between a passing look and openly staring, flirting, or making your partner feel ignored or disrespected. Couples have different comfort levels, so if it’s causing tension, talk about what each of you considers okay rather than assuming you share the same rules.