Metro Pcs

 I work for metro pcs, and I've been working there for almost a year. 2 months ago the manager of the store I work at quit and left me alone at the store, I didn't mind. I became the temporary manager until they found a new person because I'm 17 I can't work much hours, but ever since summer started I started working 40 hours a week. Anyways this new girl Abigail  came in and EVERYONE loved her like yea she's cool but my area manager and her ever since she worked they flirt and disappear for hours on end and leave me at the store alone to help everyone, and now she's manager and I get it. But she still leave me alone like all day. To go "eat" with the area manager. Is it wrong of me to be so annoyed of them?! I'm sorry it's long.