I don`t understand the lyrics of that song,could you explain to me what refersplease?10 POINTS BEST ANSWER?

Sounds to me like an old girlfriend came to him looking for help, and he let her come in because of the conditions outside, but only for one night. He wanted to let her know that the only reason she can come in is so she won't get sick, nothing else. No reconciliation, no friendship, no nothing. In the morning she has to leave and go her own way.