I (24M) was a jewelery vendor at my work wedding. Fiancé (25F) says I look like a complete asshole...

My work was having a wedding this past weekend and I was asked to be a vendor (jewelry for photos). There were a lot of people there from work including our boss, so I thought it goes would be fine. I didn’t invite fiancé though since it’s not exactly a wedding and more a work event. <br><br>When we were leaving her mother and father were giving me ass about her not being there and how disrespectful I’m being. I told them it’s not a wedding and if they had questions to ask directly to my girlfriend since we’re not even engaged (yet planned to be later this year). Her parents started going after me saying how I’m an awful person and fiancée is a sweetheart and I’m a complete asshole. Any thoughts? I felt like complete shit and now when I text she’s giving me the silent treatment.