Regarding the conversation with my boyfriend, should I send a text message to my sister and ask her for some advice?

My personal suggestion is that this sister is not her own sister, but an elder wandering outside your life circle, and her relatives must love you. However, there is a saying that "caring is chaotic". Relatives will never see you wronged. As long as you cry, whether it's his fault or not, your boyfriend will be recorded. If your sister is telling your parents, it's OK, and you will never want to be clean again. My personal suggestion is that you can find an elder outside your life circle (avoid relatives and company leaders), whether it's your former teacher or your older sister you know outside your life circle, and ask them for help. When they stand outside the circle, they can see more clearly. You can keep the surroundings clean.