On Rose Murray "When planets promise love" book, I read that the sign in the seventh house cusp describes a lot about the traits of the person who will commit to you in marriage or as a business partner. I will write you down what the book states about people who have cancer in their seventh house cusp:
Cancer/Moon: If the sign cancer or the moon are partner indicators in your chart, you could attract someone who is nurturing, romantic, deeply sensitive, moody, home-loving, protective, domestic, receptive, impressionable, and sympathetic. If this planet or sign is negatively aspected in your chart (by a square or opposition), this person might be easily hurt, maudlin, and their feelings might fluctuate like the moon. This person have been born under one of the water signs: Cancer, scorpio, or pisces - have Cancer rising or moon in their first house, or be very much interested in food, cooking, and feeding others, and be generally sensitive to public needs. They may be engaged in an occupation that serves others in some nurturing way.
I am a libra sun person and capricorn rising... cancer the sign in my seventh house cusp is square to my sun sign and opposite to my capricorn rising sign but trine to my scorpio moon sign... my moon doesnt make any hard aspects to my love planets not even to my outer planets as saturn or uranus. Anyways, around all of life, I have been attracted to people whose sign fall in my 5th house and until now, I didnt settle down for marriage. I know that if I marry a cancer, scorpio, pisces or cancer rising, or cancer moon, I will meet challenges in my marriage because the water sign doesnt work well with my very airy personality, however, deep inside, I want somebody who must have the water in them. I believe that my moon in scorpio wants that for me.
I had a lot of romantic relationships but this started when I was 22 years old, before that age, I have been in a really difficult hardship. I didnt allow myself to love anyone and I am still that way. I dont have any planets in my 7th house. I dont focus on relationships at all, I care now but what I really care about is in my career, I have a lot of planets in my MC. Lets not worry about our empty 7th house, just worry about the house that have more planets in your charts, focus on that, because our natal chart always tries to say something important to you which is to follow the path that will guide you to your destiny, not even free will can change that.
I saw people with uranus in their 7th house and saturn being the ruler of this house, these are the most challenging planets and those people have a lot of struggles in their marriage life. Glad I dont have uranus in that house