It sounds like you might be jumping to conclusions. While it could be an indicator, becoming more emotionally distant does not automatically mean he is doubting his decision to marry you. Unless he specifically said he is having second thoughts, it isn't fair to a partner to assume to know their mental state and desires. If your fiancé is in fact sure about the marriage and you are approaching him with the impression that he isn't, he might feel very insulted and not trusted. Likewise, telling him to calm down when he is experiencing actual turmoil could come across as dismissive and uncaring.

Have you openly told him that you are feeling like he is being cold towards you, and that as a result, you think that he is having second doubts about the marriage? Keep in mind that it's important to specify that this is the impression you get, as people can have completely different interpretations of simple actions.
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