Uninvited

My bf sister uninvited me to her wedding. But instead of telling me she just didn't send an invitation. When I asked her about it she said that she didn't think it was a good idea because she invited my bf ex girlfriend. And she didn't want her to feel uncomfortable. My bf and his ex has a 8 yr old daughter and they broke up many years before I was in the picture.

How do u think my bf should handle the situation?