Rochester's way of speaking
I suppose that's the point, but Mr Rochester has a very odd mode of speech. Here is an example from Volume I Chapter XV:
"You never felt jealousy did you, Miss Eyre? Of course not: I need not ask you; because you never felt love. You have both sentiments yet to experience; your soul sleeps; the shock is yet to be given which shall waken it. You think all existence lapses in as quiet a flow as that in which your youth has hitherto slid away. Floating on with closed eyes and muffled ears, you neither see the rocks bristling not far off in the bed of the flood, nor hear the breakers boil at their base. But I tell you - and you may mark my words - you will come some day to a craggy pass of the channel, where the whole of life's stream will be broken up into whirl and tumult, foam and noise: either you will be dashed to atoms on crag-points, or lifted up and borne on by some master wave into a calmer current - as I am now."
For a start, he is very, very verbose. This is one paragraph out of two pages, mostly of Rochester speaking. The only words Jane Eyre manages to slip in are: "I will like it. I dare like it." Isn't this reversing the normal ratio? He is quite presumptious too: how does he know for sure Jane has not felt neither love nor envy. Mr Rochester has a very poetic turn of phrase that he rarely abandons. Here is another bit from Volume II Chapter VII:
"I have been with my aunt, sir, who is dead?"
"A true Janian reply! Good angels be my guard! She comes from the other world - from the abode of people who are dead; and tells me so when she meets me alone here in the gloaming! If I dared, I'd touch you, to see if you are substance or shadow; you elf! - but I'd soon offer to take hold of a true ignis fatuus light in a marsh. Truant! Truant!" he added, when he had paused an instant. "Absent from me a whole month: and forgetting me quite, I'll be sworn!"
I wonder how long it took Charlotte Bronte to write these speeches. Rochester is speaking them in real time. It must very challenging for actors who play his part. No other character in the book speaks anything like this.He also has a tendency to keep up a running commentary on what Jane is feeling. Jane is obviously not much of a poker player, because Rochester rarely feels unable to explain to her (and us) what she is thinking. It must be very flattering. It's not much surprise Jane falls for him when he shows this much interest in her.