 I work in an elementary school cafeteria.  We have a bin with ice packs that the kids can put any unused milk or juice in as they are dumping their trays. At the end of the serve its my job to take care of that bin. (Among other things) my boss wants the contents saved in case someone wants it later, Be it one of my coworkers or kids coming in for after school snack. We are to toss it at the end of the week/ when it expires if we can't give it away. (We can't resell it, it's already been sold once.

Here's the thing the give take can get over loaded. In one week we can have three bins heaping. It takes up space in the fridge we need and I am running short of bins to cook with. (Multi purpose bins that fit on a steam table.) Also my boss has been riding me about temps, making sure hot is hot and cold stays cold.

All this together means lately I've been dumping more into the trash rather than keeping it all. Anything not cool to the touch goes in the trash, most of the milks, and any cartons that have gone soggy with foreign moisture or sticky. I have been trying to keep it down to one bin. 

Yesterday was a busy day, we are understaffed and I was already behind. It was a full bin, I rooted around to see if the cartons were warm came back with a sticky hand and just dumped the bin. I should have gone through it better but i was in a hurry. My boss texted after work asking about the bin and before I could answer my coworker tossed me under the bus with a series of texts that she wouldn't have sent if she knew it was a group message. Basically 'She dumped the whole thing, I was going to take some of the xxx out of it too but she just dumped it before I could get to it. Shed beed dumping them everyday lately, thought you knew."

Am i the asshole here? My anxiety is through the roof over having to go to work and deal with this issue.