So my parents have always been christian as fuck, and have always

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So my parents have always been christian as fuck, and have always firmly stood by their bible and good christian morals. (ie against drinking partying premarital sex even though i was born a bastard)
they lecture me constantly about how I shouldnt be spending the night at my girlfriends house and think i'm making a bad influence on my younger siblings by doing so.
me and my girlfriend have been together for over a year now and we're in love. for valentines day she went and developed some naughty pictures of us. (she was sucking my dick in one and we were just kissing in the others) she wrote a note on the back of each of them and she gave me a card with them also. They were all tucked in an envelope that I had hidden in a box of chocolates she gave me, they were sitting on my desk in my room.
When I was away today my dad went into my room for god knows what, saw the chocolates and thought hed have one. Instead he found the envelope and told my mom about the pictures. Them being the strict christians they are they thought "oh no not in my fuckin house" and they took the envelope full of pictures and burned it.
tldr my parents found pictures my girlfriend entrusted me with and if I tell her that my parents saw and destroyed them 1st off she'll never ever want to face them again in her life, 2nd she'll lose her trust in me. What do I do because I'll eventually have to tell her