Interpreting “顔を曇らせ” in a song lyric


In [Someday / いつか](https://www.youtube.com/watch?v=ro_j_Stzj3I), Tatsurō
Yamashita sings:

> 二度と会えない素直な愛に  
>  さよならをする人など居ない  
>  だから **いつまでも顔を曇らせ**  
>  つらい日を送る事はない

I don't understand the meaning of the last two lines.

顔を曇らせ looks like an imperative. But I doubt the lyric means: “So, assume a
gloomy face forever!!” — the rest of song sounds more hopeful than that.

Does つらい日を送る事はない mean, “it's nothing worth having a bad day over”? Maybe 顔を曇らせ
has some kind of continuative function, and I should interpret these two lines
as one. If there were a て joining them, I wouldn't be confused.

It makes more sense to me for the lyric to mean: “I _won't_ assume a gloomy
face forever”. But I don't know how to get there from the grammar.




I guess a simple way to interpret it is だからいつまでも顔を曇らせ(れば)、つらい日を送ることはない, “so
(if) you frown all the time, you won’t send away bitter days”?

