This complicated family relationship really makes me tired. I don't know what to do.

The situation you are facing is really complicated, and I understand your troubles. This situation really makes people feel in a dilemma, but here are some suggestions for reference:

Communicate with your mother: have a good talk with your mother and tell your feelings, confusion and troubles. See if she can understand your feelings and respect your decision. At the same time, you can also try to understand what is her relationship with this ex-boyfriend now, and whether it may affect you.

Communicate with your menstruation: Although you and your menstruation have different views, she is your mother's relative after all, and her views may also have an impact on your mother. You can try to communicate with her, try to make her understand your position and mood, and prevent her from misunderstanding you.

Adjust your mentality: Although this situation may be difficult, try not to let it affect your mood and daily life. You can try to turn your attention to other things, such as work and hobbies.

Consider counseling: If you feel that your emotions can't be effectively managed, or this problem makes you feel too stressed, you can consider seeking professional counseling. Professionals can help you deal with your emotions better and find better ways to deal with them.

About whether to pick up your ex-boyfriend: You can discuss this with your mother. If this ex-boyfriend has no great influence on your mood, maybe you can try to communicate with him directly and let him know your position and mood. But if you feel uneasy or stressed, consider asking your mother or someone else to pick him up instead of you.

Finally, everyone has their own life and feelings, and sometimes they need others' understanding and respect. Although this situation may be complicated, try to be calm and rational, and maybe you can find a solution suitable for everyone.