My boyfriend doesn't believe me when I tell him I love him.

I have been dating this guy for a year and a half. .But when I tell him I love him he says"its not true" every time. I told him I wish he would just say me 2. Its always "its not true" Its starting to bug me. He was the one to tell me he loved from the get go. He is a guy and he doesn't say it often but I don't tell him what he tells me. I mean should I just ignore it - is it a guy thing or does he really believe I don't love him. I show him all the time- there is no reason for him to believe that I don't love him. Help What should I do- What do I have to do to prove myself? I have done a lot.
My boyfriend doesn't believe me when I tell him I love him.
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