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Apparently the Material Girl's marriage troubles started waaay before the summer of A-Rod.

According to the Sun, Madonna began questioning Guy's feelings for her due to the insensitive way he treated her after her 2005 horse-back riding accident.

Says a friend of the couple, "from the moment Madonna fell from that horse, their marriage was doomed."

Madge wanted Guy to rush to her bedside, become her beck and call boy during her recovery (which is exactly what she expected her husband to do), but instead, all she got was a "come on darling, you’re a tough bird. You’ll be back on the horse in no time," according to a source.

Well, it does appear she did take his advice to get back on that horse after all...a horse named Alex!