His grief at your leaving is also his fear of losing the power he has had for lifetimes. Those days are over for him, and he is in turmoil. But if you are to help him on his soul's quest, you will leave him. It is your job--your sacred contract--to free him, and to free yourself.
Meditation practice is like piano scales, basketball drills, ballroom dance class. Practice requires discipline; it can be tedious; it is necessary. After you have practiced enough, you become more skilled at the art form itself. You do not practice to become a great scale player or drill champion. You practice to become a musician or athlete. Likewise, one does not practice meditation to become a great meditator. We meditate to wake up and live, to become skilled at the art of living.