Isn't it true that if you diet and exercise, and you lose weight, then, now you're satisfied and you don't diet anymore. Won't you regain the weight back because you're back to old eating habits?

But, if you exercise alone, and lose the intended weight, you won't regain it back because the weight lost was purely hard work and sweat.

I'm just wondering if i am right.

You should not diet, you should just change you eating habits. You should cut calories when trying to loose and eat a healthy about of calories when trying to maintain. The basis is to expend more calories than you take in.

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You are mistaken. If you stop working out, you are no longer maintaining the muscle you built or trained. You are also not using the calories you would have if you were excercising. However, once you reach a fitness goal, you can ease up on the excercise to just maintain your fitness and not improve it.
I worry when people say that they are going to stop a diet. That makes to no sense, If you are eating healthy and it is making you feel and look better, why in the world would you want to stop ? Its the same with excercise.

If the diet and excercise is too stressful, you need to tweak it to make it work for you.

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Jake Myers - My weight loss and fitness blog

Hi
If you understand the basic of how you gain or lose weight,you won't have this doubt.
If the calorie intake equals the calorie burnt by your body,you maintain the weight.
If your calorie intake is more than the calorie burnt by your body,you gain weight.
If your calorie intake is less than the calorie burnt by your body,you lose weight.

You body gets calories from the food you take in.Your food contains three
major nutrients ie fat,carbohydrate and protein.

Your body gets 9 calories per gram of fat and 4 calories per gram of carbohydrate and protein.

An average person needs about 2500 calories daily.But it differs depending
upon your activities and body structure.

When you eat more calories than required by the body,your body stores the excess calorie as fat ,which increases your weight.For 3500 excess calories you gain one pound of body weight.

So first you decide your daily calorie requirement with the help of a dietitian

Maintain that calorie intake with the help of a food plan.

you can always have as much food as you want.But the food should be of right type .Of course you should be calorie conscious!

When you happen to eat more calories,you can always burn them by exercises.

Exercise without good eating habits doesn't really work for weight loss. Think of it this way:

A good hard hour of working out might burn around 600-900 calories

The Macaroni Grill Spaghetti and Meatballs with Meat Sauce has 2430 calories. And that's just for dinner.

There is just no way to exercise off weight if you make poor eating choices. It all comes down to calories in/calories out and it's just too easy to eat too many calories that even exercise won't overcome.

But you are correct in saying that going on a "diet" doesn't really help anything - because you don't maintain it. You eventually go "off" diets and then gain all the weight back. The trick is to learn how to make good eating choices for the rest of your life.