How to say '謝謝再聯絡⋯' in English?
就是有種狀況，彼此都知道⋯應該不會再聯絡了吧⋯的有禮貌版說法⋯但又希望對方聽起來是五分真、五分假，搞不太清楚狀況的說法⋯呵，很難吧。

Question

How to say '謝謝再聯絡⋯' in English? 
就是有種狀況，彼此都知道⋯應該不會再聯絡了吧⋯的有禮貌版說法⋯但又希望對方聽起來是五分真、五分假，搞不太清楚狀況的說法⋯呵，很難吧。

Answer

聯絡 specifically means to contact or to get in touch. I think Bill's answer very closely approximates the Chinese meaning, but I will offer a couple other possibilities, based on the use of 聯絡 instead of 再見.
"thanks, let's stay in touch"
"thanks, I'll contact you again"

Answer

Thank you, see you again.