Nanami was your best friend, and you did have a boyfriend…….well

Your boyfriend was very very abusive well verbally, so he always took advantage of how you had no “evidence” to use against him, and you stayed with him because you were scared and still loved him, somewhat at least

He would scream and yell and manipulate you, and verbally abuse you

And Nanami knew none of this until one day you came to Jujutsu high in tears, your boyfriend had actually hit you this time