End of honeymoon phase or falling out of love?

Me and my boyfriend have been dating for 3 years. Lately he has been telling me that he might not be able to spend his life with me because his feelings aren't the same. He says he still loves me but doesn't know if it's the same strength of love. In the beginning of our relationship everything seemed perfect and now it's not so much. Do you think that it's just because the honeymoon phase is over and he is mistaking it as falling out of love or because he's actually falling out of love with me?
End of honeymoon phase or falling out of love?
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