I have always thought he was a fair weather friend.

我一直觉得他就是一个酒肉朋友。

A person who is a fair weather friend is loyal in good times, but not when things get difficult.

一个酒肉朋友的意思是，他只在顺利的日子里是朋友，不幸的日子里就不再是朋友了。

So if you are in trouble or facing tough times, a fair weather friend probably won't stick by your side.

因此，如果你在困难时刻需要帮助，一个酒肉朋友是不会站在你身边的。