Gala
I am not sure that this is the right forum for you to find an answer, for this is not a forum on spychology support.
However, I will try to give you some insight for this problem of dependency.
First thing is that you are already aware of it and that is good.
Basically dependency is a state where you consider that the person owe you what you need when you ask it(superpower), thus when you have a conflict or doubt, you feel rejected for your self and you handle the problem emotionally.
When you are in power of your self, you feel secure and independent and see the conflict as the result of a situation where you need to analyse the causes and find the solutions, to negociate with the other.
"When things don't go how i want i go into this thing were i think everything is lost and the worlds coming to an end. "
You are afraid to be rejected again, because you have suffered of the former relation, you idealize this one and as your last chance to be loved and recognised as your self. You may wonder why you are afraid of losing her, do you have matters not to trust her and think that it will go to an end ?
This is not the others who make you happy, you are the one who make yourself happy with the others, you can be actor of the situation by taking in account the events and constraints,you can't avoild them, you need to accept them and not have what you want.
I hope this can help a bit.