Have some sense!
うるさくするな
浮気をせぬ
(男なら)to be true―(to one woman)―(男女共)―be faithful―be true―(to one man or woman)―(何事に限らず)―to stick to one person or thing
You need not be so nervous.
to use force―use compulsion―do violence―attempt the impossible―(我が身なら)―force oneself―strain oneself
the act of behaving unnaturally
ばかな真似をするな.