The One I Couldn't Get Back

"You know what, have fun with him for now. But you will want me again, and when the time comes, I'll be here. Long enough to tease you, anyways," he said.
He paused for a minute, laughed, and then left.
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Angela breaks up with her boyfriend, James. And when she does, he tells her she'll want him again, and about a year later, she does. But he said that to her when she left him, so how can she get involved without knowing it's fake, or if he's getting feelings for her again? Especially since she dated Josh, his friend, two weeks after they were done?