What command does Miss Havisham give to Pip about Estella & how does he react ?

Miss Havisham commands Pip to love Estella, this makes him all the more certain that she intends to bring them together.

From the text:

Far into the night, Miss Havisham’s words, “Love her, love her, love her!” sounded in my ears. I adapted them for my own repetition, and said to my pillow, “I love her, I love her, I love her!” hundreds of times. Then, a burst of gratitude came upon me, that she should be destined for me, once the blacksmith’s boy.