How we cite our quotes:
"I don't know if I have a choice anymore." [Edward's] voice was almost a whisper. "I was wrong–you're much more observant than I give you credit for." (8.203)
For Edward, being with Bella is a compulsion, rather than a choice. He initially tried "do the right thing" and stay away, but his attraction to her (and her blood?) is just too strong.
"Do you want to ride with me today?" [Edward] asked, amused by my expression as he caught me by surprise yet again. He was really giving me a choice – I was free to refuse, and part of him hoped for that. It was a vain hope. (10.6)
Edward is giving Bella the choice of whether to be with him or not, but is it really a choice? Bella seems to think she is absolutely incapable of resisting his "offer."
My decision was made, made before I'd ever consciously chosen, and I was committed to seeing it through. Because there was nothing more terrifying to me, more excruciating, than the thought of turning away from him. It was an impossibility. (12.148)
Bella speaks of her decision to spend the day with Edward on Saturday. She makes it sound like she has no conscious control over choosing to be with him – if he's available, she's in.