Why am I like this??

So aaj scl se waapas ghar aarha tha and I use metro and auto....now since I freqeuntly use this route I know the auto fare is 80....but today the guy was asking for 100.....still I told him I was gonna give only 80 he then asked for 90 even then I was firm on my stance and told him I was gonna pay 80 and he finally agreed....but even then idk why but when I got off I couldn't help but pay him 90....why am I like this?? ;-;