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Many points in your analysis are very insightful, in my opinion. I agree with the point that William is smart and knows the press will "marry him off" the minute they read a deeper attachment into any photo they take.
"I believe the famous words of William's aunt to William's mother: "You can't back out, your face is already on the tea towels" has the potential to haunt a young man like William. He seems to be very protective and nice, so surely he wouldn't want Kate to feel that way ever. IMHO he wants for her to have a chance to back out of the relationship whenever she wants if she feels like she is not up to it. And to back out without having lost her face or her reputation. "
I think that William is a true gentleman. I really want to believe that he is creating space for her to back-out of a relationship with him and save-face/reputation and carry-on with her life post-William, if that should happen.
"the public only realized how very serious these relationships were when the engagements were announced, when the ladies in question had actually decided that they didn't want to back out of it. The same with Charles and Diana, if the books are to be believed: Charles offered for Diana and she accepted, but it took them some time till the engagement was announced officially. Diana had her chance to back out - she didn't take it, even though she had doubts. "
I also think that this is a good point, about Diana having her doubts but deciding not to back-out even though she had the space to do so.
"If Kate has any doubts she will have her chance to say good-bye to the prince without loosing the place in society she is about to take at the moment. "
I think Kate has been lauched into "society" by her close association with Prince William, and hopefully, she can maintain her new-found status in "society" even if her relationship with William ends.
"IMHO the BRF is very careful at the moment in their efforts to launch Kate in society and to give her a chance to find her own place in it in case she wants to get out of her relationship with William. "
I think the BRF likes Kate very much, but in general must be conscious of how much being linked with them changes an average person's life. The BRF can launch one into "society," but whether or not that person has staying power is really unknown in these early days. I really hope everything works out for Kate no matter what her future holds.