Pro tip: Don't work 70 hours a week. Beyond the impact on your social life, it also makes you a less effective worker (http://www.igda.org/?page=crunchsixlessons), so it's really not good for _anything_.
Seriously. Don't do this.
Seriously. Don't do this.
Work life balance in a startup is an exception, not the norm. The tech industry is simply too competitive for any slack.
It's time to walk away soon :)