Taylor Swift, Jake Gyllenhaal: Singer Likely Wrote 'All Too Well' About Actor

It's time to play our favorite game: Guess the man who wronged Taylor Swift .

It's a pastime that is sweeping the nation, as Swift's latest album "Red" has given us 16 new tracks to analyze. Previously we deduced that "We Are Never Ever Getting Back Together" is likely (almost definitely) about Jake Gyllenhaal -- and though the two dated for only a few months in 2010, it looks like Swift got some good material out of it.

An insider reveals to Us Weekly that the song "All Too Well" is also about Gyllenhaal -- to which all we can say is "duh."

Anyone who followed Swift and Gyllenhaal's short-lived romance, which included Park Slope coffee dates while visiting the actor's sister, Maggie Gyllenhaal, knows that "All Too Well" is about their time together.

In the song Swift sings about the scarf she left at his sister's house, which of course, has to be the same scarf both were photographed wearing during their relationship (that same scarf makes an appearance in the video for "We Are Never Ever Getting Back Together"). Swift seems pretty obsessed with that scarf, judging by her lyrics :

"Now you mail back my things and I walk home alone/ But you keep my old scarf from that very first week/ Cause it reminds you of innocence and it smells like me/ You can't get rid of it, cause you remember it all too well."

The 22-year-old songstress recently told "Good Morning America" that "All Too Well" was the hardest song on the album to write because it took her a long time to filter through everything she wanted to say. "It started out being a 10-minute song, which you can't put on an album. I had to filter it down to a story that could work in the form of a song," she explained.

Swift is known for writing about her exes, but it reportedly hasn't scared off One Direction's Harry Styles, who she may have already written a song about. Swift is rumored to have had a fling with the British boy band member and penned "I Knew You Were Trouble" about him. If true, that hasn't stopped him from going after Swift again, as the two are reportedly currently seeing each other.