Lots of comments already, so I'll try to keep it brief, but I just want to say that grieving over broken up friendships can sometimes hurt as bad as grieving over a breakup with a significant other. I had a huge falling out with two of my three best friends from college (thankfully right before I got engaged so they will not be in any of my wedding photos. I would have asked them to be bridesmaids had I gotten engaged only a few months earlier). It hurt like a bitch. I ended up having to unfollow them on all my social media, not to be petty at all, but because it literally hurt so bad seeing them still together constantly and me not being in the picture. It felt the same way as it did when I got dumped by a boyfriend, but it made me feel crazy! It didn't feel right to feel so much grief over platonic friendships. But, in retrospect, I think it's probably a normal response when you lose a close friendship.

It took me months and months to get over it (actually, over a year if I'm being honest) to get over it and it still stings when I see them together. But it does get better.

Don't worry too much about the photos. Many, many of the people I know are no longer on speaking terms with at least 1 or 2 of the people from their wedding party. It happens, and time will lessen the pain when you see the photos until eventually it won't hurt at all anymore.