It is improbable that a Sagittarius guy and a Cancer lady will get married.
Marriages won't be possible since a Sagittarius man's independence and the emotional neediness and protectiveness of a Cancer woman will be too much for each other.
Cancer will feel that they are better off by themselves, much like how Sagittarius' volatile temperament will cause Cancer to go through a painful emotional roller coaster.
But since there are no laws of love, if these two signs fall in love with one another, a relationship may arise.
Only if their Cancer partner permits them to be independent and move freely will Sagittarius men get married.
However, many ladies form a bond with their companion and won't allow them leave their side. Long-term marriages don't usually work out for them.