The world of startups and the world of love have so much in common, and I'm starting to realize that it comes down to two main things:
1) the world of startups + the world of love are based on the foundational pillar of Faith. Faith is the main pillar. Without it, everything else is nothing. It's a must. Faith in the dream, in the past/present/future, in each other. Assure your partner (whether it's business or love) with your words and behavior that s/he can have complete faith in you. Be open - whatever you do, do it openly and honestly. Don't play games. Don't do it. Look out for anything that'll weaken this pillar - kill any inkling or tiny bit of suspicion early and quickly.
2) the world of startups + the world of love is like a marathon. Assuming you've got Faith as a pillar that you are actively maintaining and growing - then it's about the marathon. Pace. Breathing. Stretching. Training. Growing. Working. Persevering. It takes diligence, hard work, and a common vision. If you've ever run long distances before, you'll totally get what I mean. Undeniable, unwavering focus.