conflicted

I am so confused. When this wedding process started i was so excited to have my friends with me and share this experience with them. I figured they would be happy for me and supportive. But this is not the case. I have already lost two bridesmaids and loss them as friends. Now i feel like i am losing another. I have never felt so alone in m entire life. I try to talk to andrew about it, but he really dosnt understnad. My mom says they are stuck in high school mode. One friend, who is a bridesmaid never showed up to my shower and didnt come to my graduation party. and now she is upset because i couldnt come because my dog is going through some medical issues, and i had to make sure he is ok. I just dont know what to do. I really dont think i can go through another emotional rollercoaster of losing yet another friend. What do i do? i am completely lost and starting to think i am doing something wrong.