What if I have a crush on a guy that is very immoral

So I am 16, I'm a christian and my dad won't let me give my phone number to anyone without him giving me permission first. So there is this guy that i really like and he likes me too, he talks to me a lot and he said he is eventually going to "get me". But everyone sayes that I shouldn't trust him and that he is immoral and stuff like that. And today he texted my friend and asked her for my number and I told her not to give it to him, so naturally he asked why. I said I'm not allowed to give my number to people and he said that he had something to tell me. My friend said he could tell me at practice tomorrow, and he was like "okay fine". I think he's kinda mad but I know if I ask my dad he will definitely not let him have my number. Sorry it's so long, I guess I just want advice?