Destructive Behavior...

Can you think of sex as a destructive behavior? Are all destructive behaviors bad? What makes a destructive behavior worth fixing? I know in my life I have gone out on a limb and started a destructive behavior, whether it be slightly promiscuous or drinking every weekend. I think everyone has a moment in their life where a destructive behavior happens. The question is, how do you know when your in a destructive behavior situation and how do you become strong enough and have enough will and self respect and self love to walk away from a situation that isn’t causing you any happiness? Me personally.. I normally have to be told how it really is by loved ones to get any sort of bubble going in my brain. Some people have told me that I am one of those people who may have to lose it all to find happiness again. I wouldn’t even have thought of myself being in a destructive behavior had no one told it to me.. I just thought it was a maybe a rebel phase that I was just trying new things and experiencing things that I didn’t when I was younger and obedient. Now that I think about it, was all of the destructive behavior really worth all the anguish and pain it has caused? How can you walk away from something that gives you such a high, yet you know its wrong?