He did his best, but he wouldn’t admit the same. He had to go back inside soon,
The man tried to fulfill Frank’s needs but in the end couldn’t be honest with himself or his girlfriend.
“He had to go back inside” hints at Frank’s feelings of dejection, as with Frank, the mysterious man is out of the closet, but then he runs back to his girlfriend and he’s straight again.
It may also be a reference to a specific day in Frank’s memory, showing how deep this experience scarred him.
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