I have proof of purchase that I bought this watch, and I need to override the activation code that my ex-boyfriend put on it so that I can pair it to my phone

I have proof of purchase of the watch that I bought for my boyfriend, and then caught him cheating on me and kicked him out of the house, sad story I know. I still have the watch and I’m trying to pair it with my phone however I need his pass code and he is refusing to give it to me, is there a way I can override all of that showing that I am the owner of the phone?