If your mom told you that your ex-boyfriend looks like he misses you is she right and are moms always right about things like this?

If your mom has seen your ex recently then she's probably right. Mothers don't lie to their daughters as far as telling them such a thing as she did you just to make you feel better. Your mother was young once and probably has dated many times before she met your father and you get wiser as the years go by.