Can you maybe reconsider it, like is not that black&white? That the T perhaps made a compromise, and you will need to make a compromise as well now? That it is not that you don't matter, nor it is fully his selfish endeavor, but somewhere in between? You probably had a fantasy to continue this endlessly and be special forever - he may have a fantasy to develop the best relationship possible with you, and then what else, he possibly wanted to move on.