<human>: Can you condense the text into a few key points?

Me: female 28 in a relationship with 25 year old male. 3 months long and getting quite serious.

So I recently decided to make an attitude change in this relationship by telling my boy how much I appreciate all that he does instead of focusing on all the things that bother me lately. I also mentioned, in all honesty, he has done more amazing things for me than any other man has in my entire life. He responded in a confused manner, and brushed it aside by saying it's just what he does. Why would he respond like that? Was it too much of a compliment too soon? I need to know how to interpret it so I can respond accordingly, and hopefully in the best way possible. Thanks.
<bot>: Complimented/showed emmense appreciation for boyfriend and he brushed it aside like it wasn't a big deal. I want to know why.