That's life. Some people "luck out" and get a ride for free for a wee while, and some of us pay for the maintenance of our own horses. Part of owning a horse. Here's my perspective on it: I was living abroad for about three months and a friend of mine rode my horse for free. I kept paying board on her and my friend paid for shoes and that was it. Sure, I could have found someone to lease my horse while I was in Ireland, but to be honest, that was far more hassle and I was very particular about who I entrusted my horse to while I was 8000 miles away. When I was trying to get my act together to go abroad and finishing a semester at uni, I just could not also get my head around searching for a leaser who would have been some random person off the internet or someone on the university's riding team who I did not know very well, yet my friend, who couldn't afford to pay me for a lease but who I 100% trusted with my horse's care, was happy to ride her and take responsibility for her. Fine. I was happy and not stressed about my horse while I was away. A head injury is far more stress to deal with than a jolly across the Atlantic for a summer, so I imagine your friend is just happy her horse is getting exercise and attention.