Ed had to decide between Carol and Frankie as both of them gave him an ultimatum. He had made up his mind went to tell Carol he was chosing Frankie but couldn't find her. Everywhere he went looking for her, he'd have flashbacks of all the times they'd spent at the places he was looking.
He ended up back at the bowling alley and Frankie was there, to say goodbye since he didn't give her a reason to stay. He and Frankie went into the office so he could tell her his decision. Meanwhile, Carol called someone in the bowling alley on a cell phone. Ed came running out of the office, asked if it was Carol, got on the phone, and told her to stay where she was, he had something to tell her.
He chose Carol.