There is nothing wrong with liking someone, and everyone has the right to like it. But a brother or friend's girlfriend can only be regarded as a work of art, an appreciation, and can't be revealed. Don't try to be a moral fanatic.
To make friends with people, we should attach importance to morality, be a man and do things on the basis of principles and norms. Since you call your friend a brother, your relationship with him is unusual. If so, try not to do things you shouldn't do, and don't rob things that don't belong to you. Force yourself to let go, the grass is growing in the sea, why do you have a crush on a flower, not to mention that this flower already has its own owner.
Life is like this, some fate is your destiny, and no matter how hard you try, there will be no good result. In this world, there are too many things that you like but can't have and belong to yourself. If you really regard him as a brother, you should persuade him to be nice to his girlfriend and cherish this rare fate, instead of trying to break it up.
When you really fulfill each other, you also fulfill yourself. This is not only an open-minded and noble life, but also the difference between a villain and a gentleman. The difference between a gentleman and a villain is that a gentleman understands morality and a villain only seeks self-interest.
It is understandable that you are in love with your brother's girlfriend. The essence of human nature is desire and greed. Without greedy desire, it is not man, but God. However, these desires and greed can be completely overcome, restrained and restrained. If a person does not know how to control his own desires and blindly destroys the norms and laws of being a man and doing things, he will lose his conscience and bottom line of human nature. This practice is not only unwise, but also very stupid.