I have searched for this topic and there are A LOT of threads, which is partly reassuring that it's such a common issue.
Firstly, I have older boys and can honestly say they've never had any problems with drama between friends and falling out constantly. If there are issues, they don't dwell on them and things are resolved quickly.
However I also have a girl (Y7) and OMG the make up/break up stuff with other girls (or as she refers to it, "having beef") is an absolute killer. I can't actually stand it, it gives me a pain in my chest and makes me so incredibly anxious and sad that they can't just get a long without something happening day to day, week to week.
Why are girls so complicated like this? It seems every friend DD has also mentions some previous drama with another girl, and I've noticed since being at secondary that parents really do step back from getting involved in their daughters' friendships for this reason - it's too complex and obviously it's right for the girls to learn to manage it on their own BUT I personally find it draining.
I try to help DD by letting her chat openly about it, which helps her process it and offload. She's learning how to deal with it and I can see how strategic she has to be in deciding who to stay away from and who causes the least drama.
I don't want to ramble too much but just reaching out for parents of other girls who have this endless cycle of friendship issues.