Horse not letting me tame it!

Every time I go to tame a horse, it just get naying and the horses let me get on for like a split second but, are not allowing me to tame it, I have tried everything, and I have tamed a horse before. Can any of you think of what could be happening, and how I can fix the problem?

Video of horse is too big so YouTube link to video of problem
https://youtu.be/02E_NtU81IY