how not to freak out feeling emotional with my boyfriend when he feels emotional as well?

How do I suppress the urge to pretend I'm cool when I am not?

I've always been career orientated, always do and think my own way and I'm not used to have a boyfriend who's sweet loving and caring and tells me every day and night that I'm the most amazing girl he ever squeezed and that he's proud to be my man every time he does I think that's the most adorable thing someone told me and start feeling touched and therefore keep quiet because I want to keep cool and collected (when instead I'd tell him "Ooooooooh honey that's so cute of you " and read him poetry) because he overwhelms me with sweetness! Even if I'm pretty romantic myself wrote him poetry,love letters,posters, organized indoors pic nics,moonlit drives,treasure hunts, made him a hard rock cd, gave him a boys night in kit with beer, videogames, and pizza, did all the kinky stuff but when he is the one doing it i freak out, why and how to stop it?