I think time doesn't necessarily heal all wounds, but does lessen the pain. I still hurt from my ex-T's abandonment, but it's nothing like it was when it first happened. It's been what? A day? Two? You haven't even had time to fully process this.

Yes, this T didn't turn out to be a good one. Yes, you still have feelings. And the good parts are still good. But it probably is better she left than string you along just torturing you. But it still hurts. It's still a loss.

And even if the termination could somehow be jusified (which by no means am I saying it is), what matters now is how you (OP) feel. Doesn't matter who is right or wrong (not from our end). What matters is your reaction. Doesn't matter to hear both sides of the story.