Cancers in the eyes of a Capricorn
You're ambitious, down to earth and responsible, while your Cancer is more interested in the home and family. On the surface this can make a great team, and if you can agree on just a couple of things it can be an excellent relationship.
You have several things in common with your Cancer, for example you're both home loving, and value security in a partner, and you both value financial security, tending to save or invest wisely.
The problem areas in this combination mostly revolve around your Cancers emotional needs and moods, which are likely to wear you out if not understood, while your reserved and analytical detachment will bring out the worst in them, compounding the situation.
Cancer tends to be a particularly moody and unpredictable partner by your "slow and steady" standards (you're one of the most outwardly consistent signs, often tightly controling how you react to things, while Cancer often react far more emotionally to things.
If you've previously been criticized for neglecting a relationship this may be a particularly challenging combination, as this is a partner who will become more withdrawn and distant with every perceived neglect. Your emotional debt in this respect can rapidly become fairly substantial.
You both tend to hide behind a veneer put up for the world. This can be fairly one sided however as your Cancer is intuitive enough to see straight past yours, while you won't be nearly as successful, and may end up trying to figure them out for quite some time.
One quirk of Cancer which makes this difficult is that they often have a "time delay" in reacting to things. Something happening "now" may make them happy, which reminds them of something in the past which makes them sad. On the surface this can make them appear very unpredictable, unless you take the time to understand them.
Compounding the above issues, you both can be very stubborn, and any arguments are likely to last a long time, and be often repeated. One notable flaw of your Cancer is a desire to bring up past problems and hurts, which often makes any bad situation worse.
You both value security and stability in a partner, and you both are very likely to have it with each other. However, it may not appear so - hence this is worth special attention here.
Cancer likes affection. If you focus on things outside of the relationship too much you will ignore them (by their standards) regardless of whether you feel you're doing so to benefit the relationship. This can make your Cancer withrawn or sulky.
You like stability. Your Cancers emotional reaction to things may make you question their comittment to the relationship. They don't censor emotions like you do, and aren't nearly as volatile as they appear. Cancers often laugh and cry a lot. That's just how they are - it doesn't mean they're on the verge of losing it, just because you would be if you had the same extreme reactions going back and forth in a short period of time.
There's excellent chemistry in this combination, as long as you can keep your Cancer happy enough to unleash it - a key to doing so in the long term is to make time for them, and ensure you put them first. Enjoy their emotional capacity and honesty.