I love him but....HELP PLZ?

my bf is the sweetest thng ever and we dated b4 for 5 months then broke up and dated again and weve been dating for 1 month and when we kiss now i dnt get the sparks or butterflies and when im around him i dnt feel the way i did b4....im 14 btw...and im confused and need help wht should i do and maybe yew can explain why i feel like this??? HELP