Do I have the right to feel upset?

Recently, I left my summer job because I was heading back to college. My best friend K was going through a rough time and had never worked before, so I let her take my position while I was gone. I’ve since returned for winter break, and we’ve been working together again. However, my workplace is downtown which is roughly a two mile walk back and forth, as our light rail is currently down. After my long shift (five days back to back, over 12+ miles) I sent her a text stating that “Hey, I’m not feeling too hot, but I’ll be okay as I begin to rest” since I would have an entire week until the weekend to rest and recover from so much walking . However, unbeknownst to me, she told this to our manager who is known for being a mean spirited person (despite being very lazy at work) and who has been aggressive towards the both of us. Now, in addition to having to work Christmas weekend, I now have to come in on Wednesday. She attempted to justify this by saying that she tried her best to speak with our manager, but couldn’t. However, I cannot help but feel very hurt. If someone told me that they walked over 12+ miles to and from work, I would never imagine immediately going to a manager to discuss the matter behind their back and give them additional work. This is not the first time said friend has severely broken my trust, and I chose to forgive them since we were only high schoolers at the time. However.. after this incident I’m not sure if I can keep her in my life anymore. Am I wrong for being upset?

You're entitled to feel however you feel. I think your gripe is with your boss, not your friend, and perhaps not even logical in that, either. You boss isn't going to schedule you for more hours just to punish YOU- He or she has to pay people for their time. My guess is that the people who have bee there for a while, and working full time, are asking for more time off for the holiday, and you and your friend are picking up the slack. Walking the two miles to work and back adds about an hour and a half to your work day, I'd guess. But as far as working five days - well, many people work five days a week for years. I walked to work and back for years before I had a car, a little more than a mile each way.

Hi GREENB3AR, Aggressive (to two - compared to him, presumably - "young" girls), lazy attitude towards his own work, and vindictive in nature, you say? 'Aggressive' - how? And what was this message texted in response TO: "“Hey, I’m not feeling too hot, but I’ll be okay as I begin to rest” since I would have an entire week until the weekend to rest and recover from so much walking"? Also, how do you know she spoke to your boss? Who told you and what did they say she said, exactly? And what is your boss doing, talking to one of your colleagues about YOUR hours, anyway? He sounds very unprofessional. What's the nature of business?