basically i have an ex and we used to date for 3 years on and off, we literally were eachothers first love and were so consumed with eachother we spent so much time together and just being with this person felt so right, it felt like a piece of me was missing and being with her made me feel like that was complete. obviously she did bad things and she couldnt take criticism when i was trying to fix the relationship and she would cry everytime i brought an issue up, not to attack but to just communicate. we broke up multiple times but this recent one we both literally sobbed so hard and i was recently in a relationship for a month but didnt like it cause all they did were drugs, and it didnt felt right and i didnt get any sparks but now i overthink so much about this person and ive just heard so much noise of how people think im still obsessed when i havent said anything aloud and its just stupid cause shes going to my friends asking about me and calling me annoying, saying she never wants to see me again and then continues to say oh i bet youll tell her this anyway, like?? why? but whatever: i do get sad about it sometimes and i just dont know how to stop that, i wanna know whats happening with her and just even having that thought in my brain makes me so mad.
Dear @user4970
Thank you for sharing about your recent break up. I can see how painful it has been for you to experience this loss after three years together. The feelings of acute sadness, loss and grief you are experiencing are fully understandable and relatable.
During the difficult period, pls take time to rest and recover. Spend time developing interests and pursuing your hobbies. Focus too, and family members and friends who have been a constant support in your life.
It may also help to speak to a counsellor about what you have been experiencing. In a safe non judgmental space, you can bring up what you are struggling with, process the hurt and learn strategies to manage obstructive thoughts safely.
Please know you are not alone in this journey. The hurt and sadness would take time to heal, so exercise self compassion and patience with yourself. I encourage you to take small steps towards recovery, at your own pace and comfort level. 
Keep reaching out whenever needed as you take this journey, we are with you, too.