My name was not included on my boyfriend's wedding invitation

Hey ladies! I need some advice please. My boyfriend recently received a wedding invitation from his friends and my name was not included. I have been dating my boyfriend for almost two years and have met his friends several times. I have been over their house several times and have even gone to the movies with them. I do not like them but have always been nice to them. The wedding invitation they sent said my boyfriend's name and date. Is it me or was that rude? My name is very simple & easy to remember. & even if they didn't remember my name why didn't they just ask him before sending the invitation? My boyfriend doesn't see the rudeness behind it and doesn't understand why I am hurt by this. He doesn't see how they basically just dismissed me as his significant other.