Is it normal to check out other people in a relationship?
Depends.It depends
Yes, it’s normal to notice or feel attracted to other people while you’re in a relationship. Whether checking them out becomes a problem depends on how you act and what boundaries you and your partner have agreed on.
Being in a relationship usually doesn’t switch off your ability to notice attractive people. A quick glance or private passing thought is common and doesn’t automatically mean you’re unhappy or want to cheat.
There’s a difference between noticing someone and making your partner feel ignored, openly staring, or turning it into flirting. People have different comfort levels, so it’s worth talking about what feels respectful to both of you rather than assuming you share the same rules.