When sent a package containing her boyfriend’s belongings, a conflicted lover must uncover the cause of his disappearance; but when she learns he willingly vanished to pursue space travel, she must embrace selflessness and accept his decision.

>>>she must embrace selflessness and accept his decision.
Reveals the denouement, something a logline should never do.

Further, the reveal entails a subjective need. But a logline is a statement of an initial and *intentionally* sought *objective* goal, what the protagonist wants to achieve or acquire. It is not about subjective needs, an eventual and unintentional "lesson learned".

Although the resolution of a subjective need is an element in the character arc, again, loglines are about the plot line, not the character arc.

THANK YOU so much for the feedback. I will definitely take this into consideration.

Cheers :)

I like it! But the ACTION in the second half can be stronger. Right now it only gives us her psychological growth, not a visible (filmable) action. Of course, short films are more flexible, and perhaps the climactic scene is about just that: her acceptance...

In any case, try the Logline Generator (link above), and you'll see that the better version of this logline might be along the lines of:

When sent a package containing her boyfriend’s belongings, a conflicted lover must uncover the cause of his disappearance; but when she learns he willingly vanished to pursue space travel, she must embrace selflessness and accept his decision BEFORE [Final Action].

I still think that there could be a final action that SHOWS her transformation.