AceShowbiz -

Jennifer Garner is so done with Ben Affleck. Rumor has it, the "Miracles From Heaven" actress has given up on trying to help her ex-husband from his problematic history with alcohol now that he's moved on with Lindsay Shookus.

"[Jen] feels like Ben's drinking is Lindsay's problem now," a source reveals, "Of course, Jen worries about Ben's health because is the father of her children [Violet, 11, Seraphina, 8, and Samuel, 5], but she feel slike she's done everything she can to help him over the years. It's Lindsay's turn."

Despite his struggle with alcohol, Ben continues to drink with Lindsay. "Jen is very surprised that Lindsay is drinking around Ben. But she feels that ultimately it's up to [Lindsay] how she wants to handle the situation," the source tells In Touch.

According to the source, Jennifer has been "very quietly" seeing someone and seeing her with someone else has escalated Ben's problem although he already has Lindsay. The source explains, "The relationship has completely made Ben unravel. He realizes he is never going to get Jen back."