Fiona has had a few lapses of judgment over the past few seasons of Shameless.
But Shameless Season 4 Episode 4 showed us just how low she could go in her latest relationship.
After trying to recreate the scene from Risky Business on the L train with Robbie, Fiona was determined to cut it off with him. Mike was excited to plan her birthday and she knew that what she was doing was wrong. The problem was that Robbie was very persuasive in his pursuit of Fiona.
Fiona could have easily called or texted Robbie to end the affair, but she stupidly took a trip to his apartment. What a close call that was! Honestly, Fiona deserves to get caught if she's going to keep cheating on Mike. He doesn't deserve that.