When I was more active in amateur radio, I loaned a guy we ran with my tube tester. He had it I guess a couple of years. You guys know how testy I can get. I kept pestering him to bring it to me, he wanted me to come get it. Here's the thing. I live 50 miles from him, when I loaned it to him I delivered it to where I was working in Spokane at the time, he only drove a few miles to pick it up
Finally a friend who lived in Spokane came over to see me, and interviened to pick up the tester. The jerk has never apologized, and continued to act as if this was somehow my fault.
When I was working the part time auto hobby shop job at NAS Miramar in the '70's I "thought" I had a friend. A few wrenches were disappearing from my box, which is a bit difficult to watch every second in that place.
One Saturday I was working on my car, he was as well, and I had passed by to go to the tool room. THERE WERE MY wrenches. These were very distinctive as they were Plomb brand offset box (Later Proto) he acted as if "I just borrowed them" but some had been gone for weeks. That right there was pretty much the end of a friendship.......my decision, not his.
Back when I sold auto parts someone came in, needed a pickle fork. He didn't want to buy one, I offered to loan him mine with a 20 dollar deposit. He threw a fit, acted as if I was trying to rob him. My workmate tried to explain "You'll get the deposit back" but he was off on a rant. Well guess what? I didn't loan HIM that pickle fork!!
