I need your advice please!

I am currently in a relationship with a guy I have dated for just over a year. But lately I have been really noticing this other guy. He's really cute and nice. He takes time to really listen to me and make me feel important. I don't know if he likes me but I get the feeling he might. 
Is it normal to be in a relationship and start to develop feelings for someone else?
Is that a bad sign?
Am I a bad person? Am I a cheater?
What should I do?

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