Should she be pissed off at me?

Anonymous
Tonight my girlfriend and I had a date night. at the restaurant (long horn steakhouse) we went to our waitress who is a friend of mine from highschool that I used to have a crush on. this was the first time in almost 10 years since the last time I saw her. so we have each other a hug. I introduced my girlfriend to our waitress. we ended up added each other on Snapchat and Facebook. I wanted to reconnect with an friend of mine from school. I wasn't trying to flirt. Now my girlfriend is mad because she believed I was flirting with the waitress while she was taking her order. I admit our waitress was cute, but there's no feelings there. we even got our dessert for free because of the old friendship I had with the waitress. even though I wasn't flirting with the waitress my girlfriend is still mad at me and I'm sleeping on the couch tonight. What did i do wrong
Should she be pissed off at me?
2 Opinion