Hi Giam

Welcome to the site. I'm so sorry to hear about how difficult things are for you right now. You're having a tough time indeed and having a support network in place is really valuable so I'm glad that you reached out to us. We can help.
Many members can relate to the fast paced and forced nature of this type of relationship and the push/pull you describe. This alone can leave your head spinning. How long ago did you break up and what interactions are you having with her since then?
You mention depression and a concern for your mental health overall. You're not alone there. It's common to fall into depression after these relationships and it's positive that you recognise the symptoms. Who else are you opening up to about how you're feeling? Have you seen your doctor to discuss your concerns? Having the self awareness to acknowledge what is going on for you is commendable and gives you the opportunity to get help sooner rather than later.
Your doctor may be able to help you receive counselling which can be really helpful and if you have a worry about a possible diagnosis it could put your mind at rest to be assessed. This is something I did and I felt a huge weight lift. I now take medication for a depressive disorder which helps me enormously and am in therapy which I can't recommend enough. How do you feel towards your ex at present? What emotions come up for you most often?
Keep posting and join other discussions. The benefit of community support is enormous. It's great that you found us
Love and light x