what should i do?

ok, so it is freshman year and on the first day of school i met this guy. he is actually perfect. everything about him is great. in the very beginning of october, he asked me to be his girlfriend. i was very happy. i said yes of course lol. he has met my parents and sister and has talked to my younger brother. we are going strong. his family knows about us going out but mine doesn’t. i told my family that he is just my best friend. my mom recently took him and i out to go watch a movie. when we came back, my dad started arguing with me saying that i should not have a boyfriend. my boyfriend really does not have bad intentions. he is too scared to do anything bad. we do go to a catholic school..lol. he was even scared to hold me. he is just a soft and sensitive pure kid. i just don’t know what to say to my family. should i tell them? lie? or should i just keep this a secret?