What I feel to be the best possible explanation for the ending.

Rating: 10/10 (24 February 2017)

I just got done watching it, I'm really mad at myself for not seeing it sooner, and as I'm looking online for peoples interpretations of the ending I cannot find anyone who agrees with me. However that doesn't deter me from believing what I think really happens in the end because no other ending is as happy as what I think I may have seen, if it is really as clever a film as I believe it to be.
SPOILERS AHEAD
Most people seem to think that the last resetting of time has something to do with chronology; about when the Omega died and how that was earlier than the alpha so the time reset to an earlier point, I actually find that flimsy yet I'm seeing that everywhere.
Please hear me out but what if Cage is the now the Omega in the same manner that he was the Alpha and time wasn't just resetting to an earlier point based on outside circumstances, but it was being reset to a point designated by Cage and furthermore since the resetting of the day does not result in the loss of his powers but it becomes something that he keeps the way he kept the powers of the Alpha. Cage reset the day and he can do it again, and again, and again and now he functions as the controller rather than the trigger since it was the powers of the controller and not the trigger that he absorbed this time and ultimately, and this is where I'm gonna lose you but what if as an Omega himself he is fixated on his the relationship that he has with Rita and that, while the Omega reset the day whenever it's Alpha died, it's protector, half of what it needs to feel complete, who's bond is so unacceptable to be without, altering time itself rather than go on existing without the bond, what if now he will forever and ever be able to reset the day based on the death of Rita, his own Alpha, his own counterpart.
Just as the Alpha was the counterpart of the Omega and the Omega reset time rather than allow the loss of what is identifies to be an integral part of itself, so too does Cage now reset the day based on the being that he cannot and will not tolerate the loss of, the being that he is incomplete without .... and so now... Rita will never die, Cage will not allow it and will reset time any time that she does, and the two literally live happily ever, and forever and ever and ever and ever, after. Rita will go back to being the champion and hero of the war as the new Alpha and the protector that she already was in nature, so too will Cage revert back to his truer peaceful and non-violent nature, all the while empowering his chosen Champion just as he by nature found himself more suited to a life of rallying and inspiring troops to fight than to fight himself, becoming the love and undying support that the warrior needs every bit as much as the gentle half needs the protection of the warrior.
It's a little harder to see because the roles are flipped from what we are used to in terms of gender the men more traditionally being the fighters. But it isn't who these characters are. Cage has lived the life he lived up to the beginning of the film as a coward because the fight is not within his nature. And now that Cage has a choice in the matter, WHERE DOES TIME GET RESET TO. TO WHAT POINT? To a point that results in Cage never being forced to act against who he really is as a person. And time abilities or not Rita was a soldier and a fighter to start because that's who she is inside.
Cage picked a time that not only brings his other half back to life, but to a point where they are allowed to be themselves. Because now that he will be with Rita forever, wouldn't it be best if the love they will now get to have were based on honesty and truth with both eternal partners being who they really are? Aren't all lasting relationships and loves in life built around such fearless honesty about who we really are inside? Could any eternal love really work if either Cage or Rita were trying to be something that they are not? Can any of us really be loved if we aren't willing to bear our souls and show the ones we love who we really are? And would a love without end that repeats over and over forever, would that love demand anything less?
So it's not just ending about the potential for love or lucky timing that results in Cage being given a chance to try to win her over with a clever line. That would just cheapen things. it wouldn't merit the immortality that it's been granted. Instead it happens from the best possible beginning point. Where it can be laid on the solid groundwork of not just appreciation for the other, but of the self-acceptance and honesty that all unending loves demand.