If you feel the need to sign a pre-nup, then don't get married. You're either not ready or it's the wrong person.
Pre-nup = viewing marriage as a potentially short-term, terminable at will deal + attempting to quantify love and trust + self-reassurance of protection from your spouse
Essentially, you are saying to your significant other... "Hey, let's get married. But in case this doesn't work out, at least I won't be losing out materially." Maybe that's why the US divorce rate is ~50%—society seems to no longer view marriage as a lifelong commitment to be as practical (or, in some cases, even desirable).