Krabi is the main town in the province of Krabi on the west coast of southern Thailand.  This is an area that never goes below 71°F at night and averages 90°F or higher during the day 12 months of the year.  If the plant was unhappy with me, it could be that I simply could never keep the plant warm enough.  Below the leaves of Hoya sp. Krabi, South of Thailand EPC-188: