Oh this is sweet. Master said "I feel the same as you", when I said I love you. And for me this is much better than "I love you ,too" as in German people often leave out the word love when they just say it back... Some say "Ich dich auch." Literally "I you ,too" Which I think is really poor. I know that it is really hard for him to say this, so I value every verbal expression of his love very highly.
Also I think you donīt have to say it all the time, itīs just so sweet to know..