david, Sonia been chasin alfie moon?
Depending on what the txt messages said, i'd prob react the same, although i dunno if i would of looked in the first place, but going by her reaction they must of been something in it to make her think "oh shit" or to make you think "is she?" or could just be reading too far into it and she's genuinly not fucking about but just didnt like the fact you went into her phone and make her feel you dont trust her!
hope it sorts itself out for you anyway