Depression is totally normal I am glad that you asked for help before it is too late.Depression is a way to show your emotions and how to express yourself.You have a right to show how sad you are about this issue.I know that it is wrong for them to talk about you behind your back.He might feel hurt but it not your fault because you didn't know about it. Some relationships don't always work out and it could cause problems after the relationship has ended. If you want to stay friends you want to tell him how you feel because if he won't know how you feel he will still be hurt by the issue. I think that you should talk to him about this, tell him how you feel and how it would be better if you where friends. I just recommend to you that you need to get to you that you need to get this sorted out and try to get your friendship back to normal. However, not everyone you meet in life or have relationships will treat you in the dismannered way your ex boyfriend did.
Tell your friends sorry for being dragged into this issue and reassure your friends that you are dealing with the issue and trying to get it work out to the best of your ability. Tell them you are so sorry for all the problems this issue has caused. If your friends give you hassle about this in the future try your best to ignore it and be yourself, don't provoke the situation now and she will then have no reason to be upset at you about this, tell her she needs to learn about how to say no to people.
With this will come stress and it is something that us, as humans sometimes have to deal with. Stress should not be dealt with alone and this is why we are here for you, also if your stress get the best of you please tell an adult,a parent or a teacher about how you feel.Stress and depression shouldn't be dealt with alone no matter how strong you think you are and you should not suffer alone. If your stress is getting to you, do something to get it off your mind, for example, play a sport, write a diary, scream it out, etc.
You are at a new school and it's time for a new start and you have a chance to start over. Forget about the past I know it is going to be hard but that is for your own good. Try not to bring the past with you or let it follow you. It's just like you are in a whole new world with new people, just try to change your actions so the past won't repeat itself.
Hope this helps, Derek08
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Loves like a hurricane and I am a tree bending beanth the weight.