Like most questions associated with the whole marriage of Prince Charles, and Diana, this is certainly a volatile topic. All the books I have read state that Camillia wasn't acceptable back in 1970s because of what people stated here. He could not have married her, although I find it interesting reading the opinions of others if he would have if he could have. I am not sure, but although I think part of the thing is, that Prince Charles and Camilla had the kind of love that perhaps was only deepened by him having a marriage like he had with Princess Diana. If he had never married, and the whole thing hadn't happened, I find it hard to believe Camilla would ever have been more than a mistress, although she seems to have been always more important than just that.
Diana certainly loved Prince Charles, and maybe it was youthful, naive love, but that's all she could have given at the age she was, with the expectations and circumstances and experiences that surrounded the whole thing.. She believed they were in love, she said I believe, or at least I read somewhere, that she was quoted as saying, sometime after her marriage went wrong in answer to the question whether she and Prince Charles were ever in love, that if someone could see their letters from the early days of their marriage they wouldn't doubt they had been in love. If anyone has the source for that quote, give it. But, in the end, whether they ever really were in love, it ended, in a mess. I think if there had been no Camila, the marriage falling apart would have happened anyway, but maybe less dramatically and publicly than it did. Diana, Princess of Wales never wanted to be an old fashioned princess who put up with a marriage of convenience, which is what the Wales marriage would have ended up being anyway, if much less dramatically. As for Prince Charles and Camilla, I have always thought it ended right for them in getting married, even though I am a huge Diana, Princess of Wales fan.