A friend I haven't contacted for a long time suddenly texted me one day, saying that she missed me so much. She used to ignore me, but now she suddenly ignores me. What do you mean?

Obviously, she doesn't care about you. Maybe it's because you had a quarrel with your boyfriend. You think you like her, but she doesn't like you. Only when you need it, will you feel that you don't need to kick you away and ignore you, just know how to do it. Let her know that you are also a man.