Falling in love while helping a cat woman return to her Earth alone leaves an insular college student struggling to maintain his belief in her and find a way through the gateway.

Rivercoon,

All the previous comments to the older versions of the logline apply to the latest as well.

You need higher stakes and cinematic actions/events.

A romantic idealist returns a lost humanoid feline to her parallel Earth but must battle amorous advances and hardened skeptics at college while piecing together tenuous clues to reopen the gateway to the woman he now loves.

I didn't read the other comments, sorry if I repeat some of the others.

This is confusing at best. The MC is the student, but it is unclear what he wants and why?
What is the plot in this story? What event starts it, what motivates the MC and what is his goal? To get through the gateway sounds like a step on the way to achieving something else.

If the Catwoman is in danger and he just so happens to be the only one who knows it then you could make it out that his goal is to save her, but as it stands the motivation feels labored and the goal/action are unclear.