故人以北爱荒凉旧人以南心自怜
[gù rén yĭ bĕi ài huāng liáng jiù rén yĭ nán xīn zì lián]
'To the North Lies Desolate Love With Old Acquaintances; Southwards Is Where We Feel Sympathy For Our Past Loves'. This is poetic expression showing contrasting emotions towards past and current relationships between north and south directions symbolically.