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Sometimes bitterness and hatred is not going to get us too far. There is really no point harboring all those angry thoughts of what people has done against you or made you really unhappy. It is their choice and if they choose the path that is going to lead them to hell and you've already tried your best talking to them, the best thing to do is to let them be and hope that they are happy with the choice they choose.
I think learning to let go is a key skill to attain a happier life. If we can let go what we have decided to take up from the start, things will just resume to status quo as per before the commitment was taken up. For example, let's look at relationships. Before we took it up, we were living a certain lifestyle that made us happy and our lives may be enrich by other activities such as hanging out with friends and going for suppers and etc. When we get into a relationship, our lifestyle will change drastically and our partner is almost the only thing in our lives. If the relationship ends, it is a damn crappy feeling because we might suddenly feel lost and not knowing what to do. However, if we remember what kind of lifestyle that we were living which made us happy before we got into that relationship and we can let go of that past relationship and move back to status quo, life will be easier to live.
I was not really happy over the last few months because of what happened after my recent failed relationship. However, one friend gave me an advice that "每个人都有追求幸福的权利" which means everyone has the right to pursue his/her happiness. If she is happier with someone else, then let it be and let it go. You should just go and find your own happiness. There are more important things in life that we should concentrate on than let a girl hold you back.
I took a pretty long time to remember what I used to do in the past and resume my lifestyle to my status quo. Now that I am almost reaching my status quo of my life, things are looking much better. I realized that it is best to socialize without any expectations and let nature takes it course. If things turn out to be at your benefit, then it is good for you. If it does not turn to benefit you, you do not lose anything if you can just let go and return to your status quo.
I have made a decision to be HAPPY. I think that it is what we ought to and must do in our lives.