who knows! i have many female friends and it is purely friendship, i must admit i tend not to always make a point of telling my girlfriend of the contact of these friends as it is completely natural to be jealous, but this does not mean i am unfaithful, i am a friendly person and would never dream of being unfaithful to my gorgeous girlfriend but i also do not see why i should not have contact with female friends. my point is just because he has txts from girls does not means he is being unfaithful, if he doesn't tell you in may be because of the reaction you are having which is completely natural. but on the other hand it could be untrue.... does he invite you to meet these friends? does he (if relivant) tell you on acaision what the txts say? i mean he won't do this all the time?
it boils down to trust, and if you don't feel you trust him that answers your question.....