... When [ he pauses ] I broke my engagement with Yuuri, I hated him in a way I never thought I would. Once he had been important and the person I cherished the most, yet I wanted to do nothing with him. Every time he tried to approach me to get me fix things with him, that would only make me feel even more aggravated and would make me despise him even more.
Eventually, he gave up and left me alone. As time passed, not only I started feeling less resentful, I also realized that, no matter what had happened between us, Yuuri was and still is an important person to me.
I don't know what happened between you two but maybe Roxas does still care about you, yet all he is needs time and will eventually calm down and return to you the same way I did with Yuuri. [ You once said he and Roxas were kind of alike, which is why he's telling you all of this. ]