>>109854407Yeah.
Thing is, even if they wanted to go the Rednid route, it was established in the show that RA would eventually go back to the future. Enid gave her the idea of how she and the other troopers could defeat their enemies once and for all, so it´s her responsibility to go back.
And the time skips from the last episode show that Enid stays on the present. She doesn´t go to the future so they can be together, so their relationship wasn´t meant to last.
Even if they want to leave the relationship status "ambiguous", there´s only so much you can do with RA and Enid. You can´t have them get married because then they both would have to stay on the same timeline, and they don´t.
Like
>>109857768 said, it was a teenage/young adult fling.