Wat is there in his minds??

my boyfrend is a person whom i can neva understand...the way he talks...recently he asked me for ...he wants to have it wid me...but wenever i say yes...he keeps asking if i was hurt as he went to such an extent of asking me... and if i say no...he says i dont believe in him..and i m a girl obviously there is some shame...i cant answer the same question again and again...wat do u think i shud do?