Pisces Sun sign people do get bored easily. They are romantics, but having a lot of planets in Capricorn can also be grounding for a water sign person. Another thought is that Capricorn is the sign of achievement, or one of them. Maybe at this time in your life you are more concerned with building your career, or a different aspect of your life? The wish for a reliable, responsible man is a very Capricorn concept, maybe he just didn't come along yet. I am glad you have fun dating. I think the interesting person who has the qualities you seek just hasn't come into your life. A Cancer wouldn't be boring and shares the love of security and ambition, but is more emotional and outgoing. Virgos are intelligent and also like to keep active, plus a Sun Virgo is your opposite, there is always attraction there. Be patient!