I had to look these up in a book of planetary tables because the astrology signs don't change on the 21st like clockwork every year as some believe. You are Pisces and your partner is Cancer.
Two water signs are usually compatible, you are both emotional and sensitive. The Cancer one is more ambitious and a leader, and the Pisces is the one to provide the support, though that works both ways. It should be a pretty easy relationship unless your other nine planets are in signs that clash. And even if they do, if you've been together any length of time, you should already know if you are compatible or not by the way you get along.
Both of you are creative and artistic. Pisces people understand what it's like to walk in another person's shoes, so you don't judge others, a great quality to have. You are probably a good storyteller. Water signs are psychic, so as you are together longer, you will develop a kind of telepathy where you can communicate without words.
Both of you need occasional time to yourselves, just to ponder and dream, not because you need to get away from each other. I see it as a pretty easy going relationship. The Cancer person is the planner, but you have good ideas, and also could work well together in a work situation as you are so creative, you could start your own business.
I'd say it looks promising, best wishes to you both. Take care.