Can a person with depression be dependant for life to antidepressants? if that's the case what other threatments can be worth trying?

Possibly: If there is a family history of endogenous depression possibly but so much depression os exogenous that is caused by something many people can dosomethig to help themselves through change of job, couseling, medications, new friends, relationships etc many times change helps give a new perspective on life.

Yes and yes: Ssri the most common meds for depression do not cause addition, like desire to achieve a high, neglect other activity, drug seeking...But if stopped abrupty can have some withdrawal symptoms-- ask about other option light therapy, councelling, social groups, talk therapy, exercise, etc and many self help activities.

Yes, but not usually: If a person has > 3 clear bouts of major depression, american psychiatric association guidelines suggest lifelong medication to prevent further episodes. But that doesn't mean it's always needed; many psychiatrists may still carefully observe without meds to see if they're still needed. Psychotherapy is definitely worth trying if the alternative is staying on antidepressants forever.

Sometimes Needed: I would be careful about the use of the word "dependence." usually this term refers to substances that induce a condition that makes a person want to continue using the substance. In the case of antidepressants, a person is already depressed and medication is used for treatment. Some people need chronic treatment, but the medicine did not cause a "dependency.".

Yes : All the alternatives mentioned can be helpful, but some depressions are also genetic. If you have only one episode of depression, you have a 50:50 chance of having another. If you have 2 episodes the risk rises to 75%. If you have 3 episodes, the risk is just to great to take a chance. Each episode is devastating and each risks death.