The keys to successful relationships are pretty clear, but not easy to do. You need to be honest, respectful, generous, giving, appreciative, vulnerable, and be willing to have a relationship of mutual responsibility. You have to decide that to be with this person requires you to change, to sacrifice some of what you've come to expect, in order to have a mutually beneficial relationship. On top of that, I'd look for someone who is happy, has a genuine concern for others, and has a set of values that can be described in the context of their lifestyle. Third, look for someone whose life experience has some compatible connections. Same education level, same vacation interests, etc.

Are these high standards? Of course, an entrepreneur wouldn't want to have it any other way. Correct? But they are worth living up to them in order to find someone to join you as a partner.