Prema dekhana jo chaho chalo brajdhama - Jagadguru Shri Kripaluji Maharaj, Shyama Shyam Geet (236)

If you wish to know what is selfless love, then go to Braj and see the Gopis. They are the embodiment of selfless love. They never seek their own happiness. Rather, they find happiness in the happiness of their Beloved, Shyamsundar.