I’m 24F and work in a small open office setup as a project coordinator. I have always tried to be helpful to my team, sharing stuff when asked Just to build up love and harmony but one coworker let’s call her Sarah, a 35F has a habit of just taking things from my desk like my stapler, highlighters, or even my favorite sweet mouse without saying a word. at first, it was minor, and I’d find them back eventually, but lately, items come back damaged or not at all. last month, my mouse stopped working after she used it she admitted to spilling coffee nearby and I had to buy a replacement out of pocket since the company doesn’t reimburse personal items. i talked to her privately about it, explaining that i get why she might need things in a pinch, but I’d appreciate if she asked first or used the communal supplies instead. she got offended, saying I’m being petty and that "we’re a team, sharing is what we do." now she’s barely speaking to me, and a couple other coworkers have mentioned she thinks I’m uncooperative and making the office vibe tense. our boss hasn’t gotten involved but the awkwardness is real. i wonder if I should’ve just let it go to keep the peace, since it’s a small team and harmony matters for our projects. maybe replacing a few cheap items isn’t worth the conflict? AITA for setting this limit?