Will Ryan Seacrest ever settle down? According to a source, the American Idol host and his former girlfriend of three years Aubrey Paige’s recent split came to an end because the two did not see eye to eye on their future together. “She wants marriage and kids,” the insider spilled of the model, who is 23 years Seacrest’s junior. “That shouldn’t come as a shock.” Despite the 26-year-old’s eagerness to get hitched, the TV personality was apparently not quite ready. “Truth is, he’s happiest when he’s working,” the insider revealed of the 49-year-old, who will be taking over for Pat Sajak on Whee…