trying to play catch up here again... but, remember I'm a romantic and believe in the Ali/Chris love story all the way.
Ali goes to each of the guys and tells them before their LCD's that Frank rocked her world, and she is just too unsure, questioning her feelings and her judgments. She tells them she will understand that if they don't come to the rose ceremony that it's ok... she does not expect nor will she accept a proposal at this time.
When she comes to Chris for the LCD, after thinking about what she had told him, he tells her that he would rather leave now, why keep putting on this face, and being near her, but knowing he can't have her. Just like Ali had done before, cut it now, and don't prolong it. He might tell her that he loves her, and he totally understands that she can't make a decision, but he can't pretend just for the show. (we have the voice over of him saying "I can't propose to Ali unless I know she is in love with me").
She leaves the date without it being a date and has all evening and the next morning to think about this.
When she is getting ready for the rose ceremony she has come to the conclusion from grappling all night, that she indeed loves Chris and cannot see herself being away from him. Next day, FRC... she gets dressed, goes to the podium and waits. Roberto comes and she tells him what a awesome person he is, but she does not see forever with him. He leaves, and she waits for Chris to come back and get her. But he doesn't. He has gone back to that little island Moto TauTau where the tree is in Taha'a waiting for production to arrange for his passage home (remember on the catamaran trip, he said I would want one of those islands with a palm tree).
http://img.photobucket.com/albums/v3...inBoroBoro.png
Ali knows she loves Chris... is confused that he didn't come for her, and then finally gets it figured out that she has to choose Chris before he can actually choose her back. Understanding this, she goes back to her room for the tennis shoes and the Dennis bracelet. Catching the boat taxi, she heads to Chris where he is standing there hoping against all hope that she figures it out, leaning against that palm tree.
Now this may be full of holes but that picture of Chris standing at that tree is pivotal somehow... Call it a gut feeling. Chris is the one for her based on the edit... She wants to test Chris, but needs to risk first. She takes the serious risk in letting him leave, and takes the ultimate risk in chasing him down and proposing to him.