How to deal with this kind of boyfriend?

My boyfriend used to be expressive in the beginning while he was trying to persue me.. Like he used to give me a lot of compliments and say romantic lines of particular songs for me.. Now he has stopped that.. I compliment him a lot about his personality, about his looks, about everything but he doesn't give it back.. He rarely sends 'love u's' and 'miss u's' texts.. He has showed his poems he wrote for his ex.. Being confronted about those things he says he is not so expressive.. I feel he isn't that much into me.. how to understand him? is he being real?

How to deal with this kind of boyfriend?
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