Not really AIBU, more of a WWYD.
One of my best friends, who is a brilliant guy, is crap at giving things back after lending them to him.
Back in February he asked if he could borrow thing A for a couple of weeks, I duly lent it, it's now September and no mention of it coming back. Thing A is not valuable but that's besides the point. He has a history of doing this. I've asked for thing A back and he is moaning that I have thing B of his and generally being a bit stroppy.
The difference is I didn't borrow thing B from him, I didn't ask for it but it is here. He asked me to repair thing B for him (thing B is far more expensive than thing A) and I did repair it and told him it was ready a YEAR ago. He came by to collect thing B (we don't live far apart) and decided he wanted to leave thing B here until I'd "tested" it further. Thing B is fully repaired and ready to go, as it has been for a very long time and he is aware of this.
He's always been a nightmare to get things back from (he has a history of doing this but I don't think it's deliberate, it just doesn't seem to register that he should really return stuff and I shouldn't have to chase him)
Any advice on the best way to handle this? I don't want to cause a rift, he's probably my oldest (as in longest time) mate but he's utterly shit at giving things back.