They usually have the different purposes and desires. Sagittarius is the wanderer and does not like to stop his/her choice on something certain. The Cancer wants to be sure of the love of the partner. The Sagittarius is not capable to ensure it. The Cancer lives for the sake of the future. Sagittarius lives for today. Cancer's jealousy is aroused by Sagittarius's flighty, faithless ways; Sagittarius is bored by Cancer's dependency. Sagittarius likes to wander, while Cancer is a stay-at-home. When Sagittarius feels boredom he/she begins searching for new connections/partners. The Cancer will be deeply offended by this fact. Sexually, Sagittarius is very active, and as a rule Cancer is easily satisfied. This can leave Sagittarius feeling let down and depressed and unfulfilled, which in turn will send him/her searching for a new partner. There are vague prospects of more - less steady connection.