How would you feel?

My fiance had his first day of work yesterday and he came home & I asked him if there were any hot girls, as a joke, and he said yes. Later I saw on his Facebook that he was searching her name. He said it was just to look at her pictures and its not like he wasn't going to message her & he feels creepy now but that he thinks its normal to do that. Maybe I'm just being insecure but it really got to me.