It's not like she has a choice, though.

Ben Affleck showed up for his daily dose of outpatient rehab this morning, and he brought along girlfriend Lindsay Shookus for support. The two have been spending less time together lately as the actor works on his sobriety and hangs with his kids, but they clearly can't stay away from each other for long. According to an X17 source, today is Ben's last day of treatment, though. That was quick!

A source tells X17:
    "Ben has been focusing on his recovery, but he didn't want his relationship to suffer because of that, so he told Lindsay to fly out to LA to spend some time with him. She had been in NYC, but anytime he calls, she runs right to his side. He definitely calls the shots, but Lindsay will do whatever it takes to make their romance work. She wants them to get married eventually, so she knows she has to be flexible as he works on getting better."

X17 exclusively reported that the Oscar winner was forced back into treatment by Jen Garner as a condition of seeing their three kids, but Jen isn't budging when it comes to her stance on him introducing the children to his new lady love.

"Jen has made it very clear that Lindsay isn't allowed around the kids. She thinks they've already been through enough with the split, and they don't need the added confusion of meeting the woman who broke up their parents' marriage. She also just doesn't want those kinds of pics splashed on the cover of every major magazine," a source tells us.

Lindsay better hope this ends in an engagement, because she's sacrificing a lot!