Article in English: An obsessive ex may try to initiate contact with you, such as calling or texting you, sending you gifts, etc. If you reciprocate the contact, even to say “leave me alone,” the ex may interpret it as a sign that you are still interested. The best technique for dealing with an obsessive ex is to avoid all contact.  It is best to leave calls, texts, emails, etc. unanswered. Just ignore or delete them. If your ex sends you gifts or other items, do not acknowledge or return them. Just toss them out. Because they create large networks of contacts, social media can make it difficult to deal with an obsessed ex. Your ex might try to contact you via your social media profiles, or through any mutual friends’. The best thing you can do is remove your ex from your social media contact lists: you don’t want him/her to be in touch with you, and you won’t want to see your ex's social media content. Avoiding physical contact can be an effective way of dealing with an obsessive ex. If he or she does not have the chance to see you, the obsession will hopefully come to an end. This may mean that you have to change your behavior patterns or the places you frequent. For instance, if you think you will run into your ex at a particular coffee shop you frequent, you may want to find a different one to visit. This can be frustrating, but on the plus side, you get to explore some new places and get a fresh start.

Summary in Vietnamese:
Đừng liên lạc với người yêu cũ. Xóa tên người yêu cũ khỏi danh bạ và danh sách bạn bè trên các mạng xã hội. Tránh xa người yêu cũ.