My question involves restraining orders in the State of: Illinois

I am 17 and my boyfriend is 19. In the state of Illinois the legal age of consent is 17, so I am of age there. The problem is my dad is very controlling and recently took my phone and went through all my messages. He found some between me and my bf that have suggested sexual interaction (but I am of age of consent) Now I am afraid that he is trying to get a restraining order against my bf and said he "would talk to the cops". I was just wondering if he did try to get a restraining order would he have enough evidence to do so? My bf has never hurt me in any way and is not a threat to me my dad just "doesn't like him" Please help and fast