Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: First time posting here, and also typed this in a rush, so i am sorry for any issuessss (TLDR at end)

I work in a casual position- mainly as a cashier. We've recently lost a few workers and it's been super busy at work, and recently the last two rosters posted, me and the other cashier have been put on 5 days a week (some days we work together which usually isn't common). Now, this might not seem like a bad thing, but the environment at work is extremely draining and my boss and elder co-workers are massive assholes, so, you know, I don't really want to be there all the time/any longer than i have to. I am not super desperate for money at the moment, so I didn't want more shifts (i usually would only have 2-3 shifts a week), but you know, it's fine. However since it's holiday season, my boss probably assumes that i am on break from college and have a bunch of free time (which i am not, and don't)

 However, since we lost this one co-worker, (who doesn't even do the same thing i and this particular co-worker i shall be talking about who i will call S), things have turned to shit and I have been put on a bunch and even called in to do a double shift last week. Like i said, the work is very taxing at times and my boss doesn't make it any better either. So after working almost 7 days last week/the beginning of this week (our work weeks start on a tuesday and end the following monday if that makes sense), when i finally got 2 days off before having to work another 5 days in a row when i go back i was really happy to just relax, however, today i got a message from S asking to cover their shift.

I said that i couldn't, which they responded with "that's fine", only to send another message about 20 minutes later, somewhat pleading for me to cover their shift (asking me if i am sure i really can't do their shift, even saying "pleaasseee"). I told them i really can't- i already covered S's shift earlier that week, and they got somebody to cover their shift the day after, then proceeded to leave work early when we worked together on tuesday. Usually when we swap shifts around- if you ask someone to cover their shift, you would usually do one of their shifts in return, however S never covered any of my shifts last week after i covered theirs, and i really didn't want to have to work another shift that week since i just wanted to enjoy my 2 days off.

They never gave me a reason to why they needed me to cover their shift, which isn't entirely necessary, but i just really didn't want to, although, i feel as if they did give me a reason, i would've said yes. I told them i really couldn't as i had college work to do, (which isn't a lie, i really do, but i initially was planning on doing nothing tonight), and they have since left that message on read, and now i feel guilty about it. We have to work together tomorrow and i am afraid they are going to be an ass to me or bitch about me behind my back; i am also worried that in the future (although S has since told me they wish to quit/move to a different department in our establishment) if i ask for my shift to be covered, and if i am desperate, they will say no. 

TLDR; my co-worker, S, asked me to cover their shift, i really didn't want to since i already covered their shift last week and they never covered any of mine, AITA for telling them i couldn't do their shift despite them asking multiple times purely because i wanted to have more days off?

&amp;#x200B;

not covering my co-worker's shift