What is his problem?

my ex broke up with me because he said everything was the same so i started datin someone else after i had gotten over him. i wrote him to ask him how his christmas break was going and he wrote me back asking if i really loved my boyfriend or if i was just saying that. i told him i did. he told someone else that he really did like me but when i started dating my boyfriend that he just gave up on me but he was trying to date someone before me and him broke up so i really have no clue what is going on in his head can some one please help!