You Should not have had any problems with your last boyfriend because i know that Sagittarius, Cancer, Capricorn,and of course pices go well with each other if i was you i would go with a pices capricorn or cancer and not risk saggitarius
i dont belive in astrology but i do know this because my wife is a pices and i an a capricorn and we have not had an argument once in 11 years!!!
Best Wishes With Your New Boyfriend
Billy