Boyfriend Family drama

After 2 years of dating my live in boyfriend ..we broke up ..of course both sides are hurt and angry and say mean things to each other ..after a month we began to talk and date again.a...fast forward ..his bday was coming up and he told me I would really like for you to spend it with my family and I ..even went as far to mention " I told my mother you were coming . To make the reservations.. his bday comes and his family is meeting at his house ....I'm all dressed up excited to celebrate him and his family comes in and his mother says : oh are you off to work ? When she knows I don't work on Saturday nights and my work doesn't require heels and a cocktail dress ..I giggle and say no ..are we ready for dinner ? ... the entire dinner I be nice and try to be social and his family excludes me from any conversation but I still be kind to them all.. at the end of the night when we are back to his house I mention ..I thought you told your family I was coming?.. (when clearly everyone was surprised I was there ).....he says my mother must have forgot I told her(note she has never had any memory issues before ) ...he talked to her that morning but my name never came up ..my feelings were hurt and he brushed it off saying I'm over sensitive ..am I ? ..