[header] How to cope with a nervous fiancé [title] Discuss the source of your fiancé's tension. [step] The only way to effectively handle your fiancé's anxiety level is to understand the source of the tension and meet it head-on. Perhaps your partner is freaking out about specific details surrounding your big day; maybe he/she is having doubts about marriage, period. 
No matter the problem: confront it with honesty and empathy. You must acknowledge these feelings in order to move forward.