AITA for refusing to speak Chinese with my boyfriend?

I am Chinese American. My boyfriend is Korean American. We both speak our dialects at home with our parents. <br><br>When we met, he couldn’t speak a word of Chinese and I couldn’t speak a word of Korean. <br><br>For the first few months of our relationship he would ask me to teach him Chinese words/phrases. With the basics out of the way (ni hao) he asked me to teach him how to say ‘I love you’. That was around our three month mark. <br><br>Our relationship quickly became serious, and we moved in together after about six months. My Chinese was barely used except to speak to his family. <br><br>A year into our relationship, he still didn’t know how to say ‘I love you’ in Chinese. Every time he asked me to repeat the phrase, I would refuse. My argument is that he didn’t bother practicing or remembering it even though he had ample opportunities to do so. <br><br>I admit, I was being petty. I tried explaining to him that it’s frustrating that I teach him something and he doesn’t bother practicing it. He said it’s not fair that I won’t teach him Chinese anymore.