The 6 and 7 often have a love-hate relationship, so it is uncommon to find it in romantic partners. Where the 6 is strongly committed and motivated by emotions and a need for romance, the 7 is intellectual and somewhat secretive and distant. ~first~ (the 6) requires a physical and emotional connection; ~second~ seeks an intellectual bond. This has nothing to do with the ability or desire to love, since no number is more capable of loving than any other. But challenges can arise when people have dramatically different views or strikingly different approaches to important concerns. 

Every number expresses love in a unique way. ~first~'s 6 in this part of the chart is mainly influenced by emotions and depends on expressions of love to feel safe and secure in a relationship. ~second~'s 7 is more independent, which enables them to feel comfortable in a relationship even when deep personal feelings are not shared. 

Unless this fundamental difference is understood and accepted, it can become a problem in your relationship. ~first~ may, at times, feel ~second~ is cold and aloof, and not as attentive as they would like. ~second~ needs a certain amount of distance, space for quiet contemplation, daydreaming, and just being alone. When they are in that state of mind, even ~first~'s loving attention could feel like an annoying disruption. 

When couples are unable to accept these diverging viewpoints and approaches, it can bring much unhappiness. Interestingly, despite these contrasts, the relationship often remains unbreakable. When this happens, although the differences are often obvious to others, they probably go unnoticed by the two of you. People may wonder what keeps you together when you seem so different on all fronts. 

Of course, the 6 and the 7 also have the potential to create a happy, long-lasting relationship. The key is to recognize the fundamental difference in the way you express your love. ~first~ must realize that even when ~second~ seems distant, their love is not absent in any way. And ~second~ may have to accept the fact that ~first~ needs frequent reassurance (and will likely demand attention if you are remiss in demonstrating it).

Keep in mind that this is just one area of your chart; other numbers and influences could mitigate these differences. However, the 6 and 7 will always have their unique approaches to love (and romance). 