Is it normal to like someone else when you're in a relationship?
Mostly.Normal for most people
Yes, it’s normal to feel attracted to or develop a crush on someone else while you’re in a relationship. What matters is how you handle it and what boundaries you and your partner have agreed on.
Being in a relationship doesn’t switch off your ability to notice or like other people. A passing crush can happen even when you love your partner and feel happy together; it isn’t automatically a sign that anything is wrong.