Is it normal for men to not do the things?

that they once did in the begining of the relationship. my bf use to be so sweet he use want to talk to me everyday now i feel him becoming distance .is it because he knows he have me , and theres no need to do the things he use to ,or he is trying to end it.dont get me wrong he is not in any way rude but its not the same he stop being so attentive.