In Love
Capricorn in love is a different matter. Caps tend to be somewhat distrusting of love and the other person's motives in general. People of this sign exercise extreme caution before revealing their true emotions, and this understandably gets in the way of starting romantic relationships. They would rather keep their feelings to themselves if it means risking rejection.
That said, when a Cap makes the commitment to be in a relationship, it's an all or nothing venture. These people love deeply, and will work hard to keep romance alive and well. In fact, although their outward stoic natures may make it seem otherwise, Capricorns are very passionate lovers!
Once a Capricorn marries, he/she is likely to stay that way no matter what challenges are encountered along the way. This is especially so if the spouse is a member of a compatible zodiac sign. Caps fully believe in "Until death do us part", and jealousy definitely has its place in the Capricorn personality.
In Friendship
Caps make excellent friends, and their loyalty is without question if they take you under their wing. However, woe to any friend that betrays them. Caps have long memories, and they make daunting enemies to those who are foolish enough to mistreat them.
In Career
Caps are hard workers and reliable to a fault, if such a thing can be said. They like to plan things out methodically to make sure every base is covered, and they always stick with a plan of action until they meet their goals. If Sagittarius is the project initiator, Capricorn will see the job through to completion after Sag has lost interest and moved on.
Capricorns have a healthy respect for authority, but also demand that same respect when they are in charge. They set very high standards for their own performance, and expect exactly the same from co-workers and underlings. This demanding nature can make people of this sign a bit difficult to work with, but that's not to say they don't deal fairly with others. Anyone who can live up to Cap's standards is assured of a measure of success.