Is it ever ok to ask why you were not invited to a wedding?

Two friends of mine are getting married to each other in a couple of months. I have been friends with the groom for a long time. I am friendly with the wife, but have not known her for as long. I know that people can’t invite the whole world to their wedding, but I thought that the groom and I were fairly close. Plus, they seem to have invited everyone else from our friend group at synagogue. Would it be gauche for me to ask why I was excluded. My gut decision is that I should keep silent about it, but curious to hear your thoughts.