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 Just as Scarlett Johansson says that her marriage to actor Ryan Reynolds was “the best thing I ever did,” reports say that she is “pissed” Reynolds has moved on to “Gossip Girl” actress Blake Lively. 
 
 Page Six sources say that Lively and Reynolds are looking for an apartment together. And a source tells Us Weekly that Johansson is not happy that Reynolds’ relationship with Lively, his co-star in “Green Lantern,” appears to be progressing so quickly. 
 
 BLAKE AND RYAN PLAY HOUSE 
 
 “Scarlett is pissed that he’s not under her spell anymore,” the source squeals. “Ryan would have gotten back with her. He was so totally in love, but then she flaunted Sean right after their split, and he was done.” 
 
 The fact that Johansson and Reynolds were still married while he filmed “Green Lantern” with Lively in New Orleans probably doesn’t help. The film wrapped in August 2010, while Johansson and Reynolds didn’t announce their split until December of the same year. Their divorce was finalized last July. 
 
 Johansson certainly sounds wistful about her defunct marriage in the new issue of Cosmopolitan, calling it “the best thing I ever did.” 
 
 “I’m a big believer that when something feels right, you should do it,” the blonde bombshell shares. “I’m a big believer in instinct. Getting married was the right thing to do because it was natural. It grew out of a romance and love and a desire to have a future with somebody and I was very fortunate that I married somebody who turned out to be the person I thought he would be.” 
 
 But she also shares what went wrong. 
 
 “Relationships are complicated and being married is a living, breathing process,” she says. “I think I was not fully aware of the peaks and valleys. I wasn’t prepared to hunker down and do the work … Both of us were extremely busy. We spent so much time apart.” 
 
 The actress, who is rumored to be casually dating Joseph Gordon-Levitt, puts a happy face on life after Reynolds. 
 
 “I’ve never been single for a chunk of time before,” she says. “You miss having a partner and a confidant, but I have to say, I’m appreciating having the time to get to know myself.” ||||| Blake Lively and Ryan Reynolds heat up off-screen, reportedly visit one another on film sets 
 
 Eric Charbonneau/WireImage Blake Lively and Ryan Reynolds are reportedly the latest hot item on the red carpet. 
 
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 The romance between Blake Lively and Ryan Reynolds is heating up. 
 
 Although the "Green Lantern" co-stars have yet to confirm they're a couple, a source close to the actors tells us their relationship is getting "more serious" - and another insider says Lively just made her second trip to Boston to visit Reynolds. 
 
 "[Ryan] really respects her," the source says, adding that the two hotties - who, last year, denied reports that they'd dallied near the end of Reynolds' marriage to Scarlett Johansson - stayed in contact throughout Lively's relationship with Leonardo DiCaprio. 
 
 The leggy Lively and abs-fabulous Reynolds have certainly been spending more time together recently. 
 
 According to another source, after Reynolds reportedly visited Lively on the New York City set of "Gossip Girl" on Oct. 8, the actress reciprocated by heading to Boston - where Reynolds is shooting the fantasy crime picture "R.I.P.D." 
 
 On Oct. 5, we first reported that Lively spent the weekend at Reynolds' Back Bay apartment in Boston just days before her split with DiCaprio was announced. 
 
 Our source says that Lively, 24, and Reynolds, who's 10 years her senior, were spotted having a romantic dinner last Monday at Mistral Bistro, an upscale French restaurant in Boston's South End. 
 
 We hear that Lively even picked up the check. 
 
 The source says Lively wanted to spend "a few days" with Reynolds, but was only able to stay one night. 
 
 She returned to New York City on Oct. 11. 
 
 Reynolds seems to have remained on her mind, however. The source adds that Lively did some serious shopping at Bergdorf Goodman's men's store on Fifth Ave. on Thursday. 
 
 The actress was spotted leaving the store with three bulging bags of clothing. 
 
 Presents for Reynolds, perhaps? 
 
 Lively didn't forget to do a little retail therapy for herself. That same day, the actress - who's the face of Chanel's Mademoiselle handbag line - dropped about $5,000 at the Chanel SoHo boutique. 
 
 A spokeswoman for Lively did not respond by our deadline. 
 
 Although Reynolds and Johansson never publicly cited the reason for their divorce, which was finalized in July, the Lamborghini-curved Scar-Jo recently told the German magazine Gala that she can be "overcritical - with myself and with other people" and "incredibly impatient - regarding my job, my family and men." She added: "I want things to progress. I hate stagnation!" 
 
 As for Lively's ex-beau DiCaprio, he's recently been linked to Australia's "Next Top Model" Alyce Crawford, although Crawford has said they're "just friends." 
 
 Contact Gatecrasher: 
 
 Frank DiGiacomo: fdigiacomo@nydailynews.com 
 
 Carson Griffith: cgriffith@nydailynews.com 
 
 Adam Caparell: acaparell@nydailynews.com
– The surprise announcement that Scarlett Johansson and Ryan Reynolds are ending their marriage may be linked to sparks between Reynolds and saucy Gossip Girl Blake Lively on the set of their recent movie. "Everything wasn’t exactly up to wedding vow snuff" with 34-year-old Ry and Lively "canoodling" during filming of the Green Lantern earlier this year in Louisiana, reports E! Online. It was Johansson, 26, who reportedly pulled the plug on her 2-year marriage. Lively, 23, has apparently already moved on to another Ryan—Ryan Gosling, 30, who could barely come up for air at the Manhattan premiere this week of his new movie Blue Valentine. Click for more background on the split.