Two girls proposed me today!! what should I do?

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Today was the happiest day of my life till now. Two girls proposed me today. Both of them are my friends but they don't know each other. You must be wondering why is this guy asking this stupid question " What should I do?" .The problem here is that I don't have any feeling like love for any of the two girls and since both of them are my good friends I'm not sure how will they react when I'll turn down their love proposals. I'm even not sure whether we will be friends any more.Please help me friends because I know the value of true friends and I don't want to lose even one of my good friends. Please sort a way out. Please please please.