Former flame, beaming away

No cursory greeting. No smiles. Not a single word exchanged. Rather, no contact, at all.
Reportedly, Katrina Kaif and Salman Khan were filming at the famed Mehboob Studios in Mumbai at the same time. And the air was tense with the probable outcome of fireworks, if the unpredictable Khan and his former flame did manage to come face to face!
Khan was facing the arc lights for his home production 'Dabanng', while Kat was beaming away at a photo shoot for Zoya Akhtar's 'Running With The Bulls' starring Hrithik Roshan, Farhan Akhtar and Abhay Deol.
The staff members posted right outside their respective vanity vans took express care to see that the eventuality did not arise by alerting each about the other's movements, from time to time.
Says a close source, "The two ex lovers kept a very safe distance from one another. At an earlier time, Salman had dropped in to chat with Hrithik in his van when he was shooting for 'Guzaarish' in the same premises. But this time, Duggu also did not come to meet Salman or vice versa. Everyone completed their work and left immediately after pack up was announced."

Please explain to me the emboldened parts.

Source : http://in.movies.yahoo.com/news-detail/87548/Kats-Distant-Sallus-Silent.html
I guess "former flame" means "ex-girlfriend" though.