being friendly with a boy you aren’t romantically/physically attracted to and him developing feelings for you isn’t your fault, nor does it mean you were “leading him on”. you are under no obligation to date him.
But like why do you hate Taylor Swift? Among artists who sing about date rape and beating gay people and objectifying women, what is it about her that made you decide that she is the scum of the earth? Do you have a problem with jam? Are you offended by her high waisted shorts?