My girlfriend is too kind to her brother, regardless of my feelings?

When your mind becomes more mature, you will feel much better. Because they are brothers and sisters. Also, if you regard him as your own brother, do you feel different? Her feelings for her brother are relatives, but for you, they are lovers. So this feeling is different, you have to trust her. You should know that blood is thicker than water. Brother and sister had been together for many years before they met you. If you think she loves her brother and values him more, and your heart is sour, it should be that you love your girlfriend more than your girlfriend loves you. As a sister, caring for her younger brother is only a natural expression of maternal feelings and cannot be compared with the relationship between men and women. Just as your mother pays attention to you at any time and place, she is much less interested in your father. Either she is a younger brother or a younger brother is a sister. This is a truth, quite outrageous and possible.