secret older boyfriend discovered by dad

my daddy just found out somehow that I have been dating an older guy for 7 months and lying about where I have been going and who im with. now I cant go anywhere without a parent with me and im questioned about everything. im very reluctent to tell him a lot of things about the guy though, and he still has a lot of unanswered questions. I really dont care for my dad because of a lot of things in the past and now im just mad at him for saying he thought my relationship was sick and that they guy probably didnt even like me plus he read my text messages and spys on my computer too. if he questions me about the guy again should I tell him stuff and try to make him understand everything I know about the guy in my heart? or should I just keep refusing to talk? ever since he confronted me about this I havent been able to stop crying and worrying. im so scared that I cant sleep or eat and im not even able to go out of my room without freeking out because I dont know who knows what in my house. and now I have to go see all of my family 2mrw and I still dont know if they know anything. and now I cant even look at anyone in my house because im so freaked. I also have a lot of questions to ask my dad about this but im refusing to speak to him unless I really need to.plus when my dad told me I cant see or talk to the guy anymore I called him to telll him thinking hope was lost but he says he wants to wait till it blows over and he will change his number and we will just have to hangout with my friends around more often, I like him a lot, but I dont know what to do.