Why am i so scared...

My boyfriend and I have been together for two years. He's met my dad 2 times. I found out recently that he possibly might be moving away and I'm trying to spend as much time with him. I'm stuck at my dads house till break ends and I wanted to invite him over. I'm absolutely scared to ask my dad because he's never been over neither have I asked. My step mom said she would love if he came over but I've never heard anything from my dad except a year ago when he wouldn't let him over for my small b day party(he didn't meet him at that time yet). Now he's met him twice and I'm scared he's gonna say no. I don't know why. I know this sounds very childish sorry :/