Sandra Bullock has reportedly been on a string of dates with her ex-boyfriend.
Sandra went on to marry Jesse James, who she divorced from in 2010 over cheating allegations, while Troy also suffered a failed marriage.
Finding themselves single again the pair are believed to have got in touch through a mutual friend before Christmas.
"Sandra and Troy have always got on well, but she doesn't want to publicly date him until she's 100 per cent ready for a relationship," an insider told British magazine Closer. "She's also worried about getting her heart broken, so a no-strings fling is fine, but she's not committing to anything yet."
Another reason why Sandra is said to be apprehensive about starting a new relationship with her former flame is her son Louis. The brunette star began an adoption process with ex Jesse in 2010 and gained custody as a single parent.
She wants to make sure things are settled before revealing who Troy really is to the youngster.
"Sandra hasn't introduced Troy to Louis as anything other than mommy's friend," the source added.
Her relationship with her Gravity co-star George Clooney was recently put under the spotlight. However Sandra previously insisted their relationship is platonic and joked about her late night drunken phone calls to him.
"You know what? I'm so embarrassed for him because I think he's showing his vulnerable side. It's a booty call. But then he wants the commitment and the marriage and I'm like 'Dude, I don't have the time.'
"And then he's all 'But I'm not a one night stand kind of guy.' Well, then, I can't. Drunk dialling is what it is, George. I just need an hour of your time," she laughed to Entertainment Weekly