Are secrets good for your relationship?

It's always drilled into our heads that you shouldn't keep any secrets from your partner.If you want a happy life, you must share everything with him/her. But should you really share everything with your partner? I do. I usually tell my husband everything. Maybe that's because I'm newly married and I think I should tell him everything or maybe I don't want any "you did that?" episodes in the future. On one of our girls' night out, the discussion veeredtowards how open should you be with your husband/boyfriend. Is it necessary to share every minute detail of your life with your other half? But my girlfriends think I shouldn't. That's advice coming from happily married women. So theremust be some truth to it. They say there isn't any need to tell your husbandeverything. Their argument makes sense too. You can't undo what's done, so why burden him with guilt and in the process cause heartache to both? By not talking about something with him/her, you aren't lying. You're just not, you know, sharing. I think it's just easier to share what you've done and resolve the issue rather than be guilt-ridden for the rest of yourlife. My belief is, if you love each other, you'll support each other, no matter what. Then again, I might just be romanticizing. Since there a bit of sense in both the arguments, I've decided to go with my instinct, should a need arise for one. Share with him when I think he'll understand and not necessarily tell him something if it isn't hurting anyone by not tell him. And anyway, who decides what makes a relationship work?