What my dream means? Help!?

I saw a dream that I was in an unknown wedding, I was one of the bridesmaid. my dress was a navy blue dress. It was long and has some shiny stones on it. Most of my relatives were also in this wedding. People were bringing candy and gifts and they just put the gifts on the floor next to entrance. My grandmother, who was sitting on a table next to the entrance got mad that why people are so disrespectful. I agreed with my grandmother and started to organizing them and made a pile of the gifts in the same spot at the corner. Except me and my grandmother, evey body else, were dancing, was outside smoking and didn't care about anything. The guy also who was groomsman standing with me, was also one of the guy that, who likes me in real life. So, I don't know what it means. I also saw my ex, sitting and watching at me, while I was dancing.