Three of us went out. I had a couple drinks and so did his friend, my boyfriend only had a water. When it was time to leave his friend looked at him and asked "split the bill?", My boyfriend said he only had a water and his friend then said he's got the bill and payed for my drinks. I told him we could split it but he refused. I felt so bad , I asked him how much it was later so I can etrasnfer him and he said " no worries get my drinks next time haha ". Why did he pay when I offered to split it?