I lied to her. Help me!

Here's what it is... we text eachothers very often. Now one day while texting, she asked me do i love her more than any1 else. I told her i do. And we talked about a lot of romantic things. I asked her if i can hug her. She said i can...next day in school i asked her about last noon. She said it was her sister who wrote . And yes, after i said i love her she said she loves me too. I mean her sister.now i got very sad and angry and i said it was my bro who said i love you and the other things. Now She thinks it was my brother who texts her. Now what shud i do? Im tired of lies. What if the truth hurts her? Help me !!!