Am I being petty?

I drive our dodge truck instead of my husband during the week because of gas mileage since he drives so far to work every day. One day he came home and said Can I take the truck with me to work tomorrow so I can show someone that my truck is more bad ass than theirs? I asked who it was (he said the last name since it's the navy) and today I was bored and searched the name on FB and it's a really pretty blonde chick who he mutual friends with. So he pretty much wanted to show off to a chick. Am I being petty that he shouldn't be trying to show off to other women when he is married? idk I feel hurt about