The Toxic and the Fun Cycle Continues

I had a very similar situation in middle school and high school where i had this friend on and off for probably six, seven years. And it was the exact same thing. We'ud be good for like a few months, maybe a year, and then she would start to get really toxic. The only way that you guys could be friends in a way that's healthy is if you guys take like, a solid three years apart. Maybe even five years. That's ho long it takes for somebody to really evolve. Butfor right now, i can almost assure you that this will just continue. This toxic and then fun, and then toxic and thenfun cycle will just continue for ever