I am a male dragon & have been in a relationship with a female monkey for over 5 years.

We split & seperated from one another 6 months ago.Recently she contacted me & wants us to try again.We talked of Marriage before,is it a good idea for us to Marry?
The problem we have is I am Cancer in western Astrology & she is Saggitarius so we are not a match that way.
Can we overcome our differences & be Happy in our relationship?