~first~ and ~second~, this aspect of your chart suggests compatibility can only exist if your roles in the relationship are quite different and somewhat separate. You both have unique qualities, but they rarely overlap. Perhaps the best way to describe the differences between your numbers is to look at them from a business rather than a romantic perspective.

As business partners, you could do very well - if you play distinct roles. The 5 (~second~) is excellent at promotion and sales; they are dynamic, articulate, thinks fast, and find solutions easily. Because ~second~ can see through facades better than most people, it is easy for them to influence others and resolve personality issues. 

~first~, is a visionary, has a strong commanding presence, and has the persistence to overcome obstacles. The eye of the 8 is always intently focused on a future goal - a goal that will be met no matter what. ~first~ is the executive, ~second~ the marketing expert. These are quite different qualities that can work well together if they recognize neither should try to tell the other how to do their job. 

In a romantic relationship between the 5 and the 8, a similar picture emerges, if you do not tell your partner how to behave or what to consider a priority, things should be fine. 

Other issues that appear in this combination have to do with ~first~'s assertive personality and ~second~'s social nature. ~second~ does not do well being told what to do, and quickly rejects authority. ~first~ may become jealous or envious of ~second~'s social life and many friends. 

Your key to a successful relationship lies in giving one another space and freedom. Your relationship can be pleasant and long lasting, but you will probably need to be realistic about your expectations and maintain some distance in your lifestyles and day-to-day routines. 