AceShowbiz -

Neither confirmation nor denial has been made by Reese Witherspoon and Jake Gyllenhaal on reports of them splitting up, but details on their much-reported separation continue to tickle out. A source close to Jake tells the newest issue of Us Weekly that the pair broke up over the phone after fighting "constantly in the past few months." Though so, another source affirms there is no third party involved, saying "No one cheated. There was no drama."

On what prompted Reese and Jake to call it quits after three years of dating, sources say the actress' divorce from former husband Ryan Phillippe and also their kids; Ava Elizabeth and Deacon Reese, were the two driving factors in the split. "She felt pressured to wed again but she wasn't ready. She couldn't give Jake enough and she got cold feet. Jake wanted all of her," reveals an insider.

"She really worried that they didn't have enough in common," Jake's friend chimes in. Another source adds, "When she was giving all of her energy to Jake, she felt like she wasn't giving her kids enough. He was great with the kids, but she felt like he didn't get the whole scope of what that entailed."

Reese Witherspoon, 33, and Jake Gyllenhaal, 29, began dating after they first met on the set of their 2007 thriller flick "Rendition". The actor reportedly has moved into the actress' $5 million home in June 2008. The fact, however, doesn't make the pair immune to break-up reports, the latest of which was brought to attention by E! News earlier this week.