BENONI, SA: Sean Penn is allegedly using Charlize Theron to get even with his ex-wife Robin Wright. The actor was left furious when Charlize got together with her now-fiance Ben Foster. ‘Sean has been seething with jealousy ever since Robin got together with Ben in 2011 and he went nuclear in December when he heard they were engaged,’ a source said. Sean can’t stand the idea of Robin finding happiness with a man 14 years her junior and 20 years younger than him. ‘For the first time in ages, Robin feels happy and settled,’ said the source.–SY