So my roommate was moving out the other month to get more workspace for school, as well as due to some logistical reasons and some personal conflicts. We shared a lot of stuff communally so when it was time to move out we naturally ended up talking about what stays, what goes and how to go about it. We agreed if anything valuable they originally bought was to stay behind like appliances or furniture that I needed, I could pay for it. Once they got their new place the plan was that they would start making trips of mostly the big stuff and then after a while if there was still some communal things left over that I didn't want, I would start a box and we'd go over it. 

This is where the misunderstanding started.

I waited 3 weeks after they got their new place and they had started taking trips. I helped move and put stuff together, packing and all that. It was all going smoothly, and we were still on good terms. I called them and mentioned casually that there were still a few things left behind, and that I was going to put them in the box like we mentioned. I gave a few examples (this scarf, that jar) and the conversation went well.

I maybe definitely went overboard on the box. It wasn't intentional, but when my roommate came back to pick something up and say hi there were probably 30 or 40 things, and they definitely didn't fit in the box. It also wasn't sorted, it was mostly just a pile on the couch :/

Roomate lost their shit, called me at work crying and said all of this stuff about how I was trying to get rid of them, how I only wanted to keep the 'good stuff'... Apparently their foster parents neglected and mistreated them, and one of the things the family did was throw all their stuff in a pile... I had COMPLETELY forgotten about that, but I did know. This was a really distressing for Roommate and I apologized profusely. They had to go to work right after seeing the pile too, which hella sucks. I probably should have known better and it did go through the back of my head that putting your roommate's things in a pile was something you did to kick them out, but I ignored it because we had talked about it first. 

I ended up taking the pile apart, sorting it, putting some things back... I felt really bad and wanted to make it better. We're on good terms again but I still feel terrible.