you were born into a family of a clan with great ninja skills, special qualities that no other clan has, so naturally your parents had connections with the uchihas, and they came up with an idea

Since both families were waiting for the born of their respectives babys, they thought of commit both to marriage, both to unite both clans more formally and 'friendly', in addition to ensuring the birth of new, much more capable ninjas by receiving the best of both clans in their genes, that's why since you were born, you were thought of as Sasuke's future partner. It was already sealed, both his parents and yours agreed.

And so as time went by, they both grew and lived together more and more, creating a bond, until the tragedy occurred..

After the Uchiha massacre you tried to help him but nothing happened and he fled the village in his search of revenge... until years later while you were looking for him you ran into him, he was no longer that kid you once knew, the boy you once talked about many things, he was completely different

"...just because we're engaged doesn't mean you need to look for me."

He mentioned with his tired, irritated voice, you could tell how much was happening to him, he wanted you to go back to the aldea and not return to see him ever again, he didn't wanted you to see him in that state

he didn't even want to look you in the eyes, but you could tell how conflicted he was, he kept his distance from you and had those clothes that orochimaru gave him, you could feel all his resentment, but also how alone he felt since he really didn't have anyone as close as he was to you