It is been 6 months since we broke up and I cannot stop thinking about her even though that she has blocked me everywhere and we have no contact. What do I do?

you should try and get in contact with her and talk things through to make sure its not one sided. if she doesn't want any contact with you I do suggest you try and move on. maybe meet someone new. if she responds and wants to talk things through you could see why things ended and why she doesn't want to have any sort of contact with you. try to understand her and be there for her. if it is something you have done maybe try and work through it by building trust with her again, so you can try and move on.

From experience, the best thing you can do is concentrate on yourself. When you concentrate on yourself, you become more focused on your wants, needs and well-being. After a while of getting used to this, the thoughts of a past significant other will begin to fade. No. you will not forget about them completely but you will not be thinking about them constantly or even at all. So find some new hobbies, focus on school/ work, try something out of your comfort zone. Always make sure to be doing something because sitting around will always lead back to thinking about your ex.