Take time to do the things that make you happy, and anything that helps you clear your head. If you haven’t spent much time away from your partner before, this is a good opportunity to get a taste of what life would be like without them. It can also help you unwind and determine if stress was causing you to question your relationship. Not only can some alone time help you sort out your feelings without any pressure from your partner, but it will give you time to compose yourself and decide exactly how to proceed. If you’re currently in the relationship, use tact when speaking with your partner. Begin your sentences with “I” rather than “you," because you don't want to sound accusatory or hurtful. Instead, discuss how you’ve been feeling in the relationship. If you aren’t currently in a relationship with this person, decide if communicating your feelings is appropriate. It may not be appropriate if it could toy with their emotions, or if they have a new partner.  Once you decide to start voicing your feelings, things may get complicated. Don’t do this unless you’re sure it is something that needs to be addressed. Often times it is easier to write your feelings down so that you can say everything you need to say. Writing a letter can be a great way to communicate with your current or past partner. In other words, get yourself out of the awful gray area. If, after all of this, you want to stay together (or get back together), then do so wholeheartedly. If you want to break up, do so completely. You have to commit fully to whatever you choose! If you are in a relationship yet constantly doubting it, your relationship will suffer. You can’t have one foot out the door and expect love to flourish. On the other hand, if you decide you do not love the person, you must end things completely. You will not be able to start a new, independent life if you continue to ask “what if?”

TL;DR in Vietnamese:
Giữ khoảng cách với người cũ. Trò chuyện với đối phương về cảm xúc của bạn nếu phù hợp. Tìm một kế hoạch và bám vào đó.