Since you already know that two people can't be together, you don't need to continue to insist, or like each other, you say you like him, but you can't be responsible for this like, you like him, and you can't be with him, you can't give him a home, accompany him for the rest of your life, you don't have these plans, like a person to be responsible for each other, but also responsible for yourself, the only thing you can be good to her now is to stay away from him, let him live his life well, leave, disappear to let go, Then live your own life and find someone you really love, someone who loves you, that's what you really like.
Who hasn't left someone's memory on the path of life? So when you encounter this situation, you must first calm your mind, keep your sanity, and know that two people can't walk together, and they can't become husband and wife, then you have to accept this reality, know that you can't do it, don't do it, don't have unrealistic illusions, and don't waste your time and energy because of this.
And the most important thing you should do now is to keep the distance between the two people, avoid excessive dependence, you need to re-establish the center of gravity of your life, enrich your life, and make yourself more independent and confident, because only in this way can it help us to better control our emotions.
You can try to find other love and emotional sustenance, you can transform this love into other pursuits, such as work and study, it can be a trip that you can go, so that you can live a more fulfilling and confident life, so that you can better control your emotional life, and will not be trapped by love.
Psychologically, you have to try to maintain a healthy psychological state and a positive attitude, you have to re-examine the relationship between you and the other person, you have to find a healthier love and lifestyle, do not indulge in your own emotions, but also focus on a broader social and entertainment interest in life, and maintain a positive attitude.