updated 04/17/2012 AT 2:30 PM ET
•originally published 04/17/2012 AT 3:00 PM ET
“Jen moved on a long time ago, and she is trying to just focus on her own happiness,” a source says of the actress, 43, who will celebrate her 1-year anniversary with boyfriend Justin Theroux in May. Pitt and Jolie announced their engagement last week.
“Jen is not a bitter person and she has always wanted Brad to be happy,” says the source. The couple divorced in 2005 after five years of marriage.