Boyfriend and dad

Bethany
So I'm 15 and my boyfrind is 17, we got together a month ago after talking for a very long time, I told my mum a few days after he had asked me out, she was fine with it, which I thought she wouldn't. My parents are divorced so I asked her not to tell my dad just yet, a few days ago I finally found the confidence to tell him, and he goes off on one saying he better not f****** touch you or I'll break his legs and he's a c*** and he's never even met him! Today he even made up a lie calling my mum saying I had made a doctors appointment! Which I didn't, now my mum is doubting my boyfriend but he is the nicest kindest boy I know he knows how to treat my right, yeah things have happend, but my parents will never know about that but still I don't understand his reaction! It's ridiculous and has made me really angry and upset I really don't know what to do anymore!😭😭😭