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"It broke his heart," an insider told the mag.
A source close to Gyllenhall added that the pair "fought constantly in the past few months," and that they eventually ended things over the phone. Another source says there was no third party interference that caused the split. "No one cheated. There was no drama."
But the couple, together since 2007, allegedly had different agendas. Divorced from actor Ryan Phillippe, Witherspoon (mom to Ava, 10, and Deacon, 6) wasn't ready to tie the knot again.
"She felt pressured to wed again but she wasn't ready," an insider says. "She couldn't give Jake enough and she got cold feet. Jake wanted all of her."
And, as much as the two enjoyed being together -- they moved in together in June 2008 -- the insider claims Witherspoon felt torn: "When she was giving all of her energy to Jake, she felt like she wasn't giving her kids enough."
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