In this instance, “back home” does not mean “to go back home”. It simply refers to the girl in his home town/city/country i.e. where “he” grew up, where his parents are, etc.
1 มิถุนายน 2015
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Back home in this context means "back in my home town" and not "to go back home".
1 มิถุนายน 2015
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The girl waiting for him to return to her.
17 มิถุนายน 2015
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the girl was at home, "back home" refers to the girl, kinda "He kept his promise to the back home girl", that is "the girl who stayed at home"