I'd say it's about a break up. She's running away, while he is not the kind that gives up easily. The reference to the girls in magazines? I'd say he means that even though he knows there's plenty of prettier girls, he sticks with his girlfriend. Because he loves her, and he will not give up. He will not walk away. But then all the sudden, she does. He withstood the temptation of walking away, but she didn't. And thus she is a coward in his eyes.
I'd say it's about a break up. She's running away, while he is not the kind that gives up easily. The reference to the girls in magazines? I'd say he means that even though he knows there's plenty of prettier girls, he sticks with his girlfriend. Because he loves her, and he will not give up. He will not walk away. But then all the sudden, she does. He withstood the temptation of walking away, but she didn't. And thus she is a coward in his eyes.