Hard to know what your ex meant by "peaks and valleys".
I'm trying to think what it would mean if my ex said that to me during the relationship and after as you have stated... .
"I always said there would be peaks and valleys in this relationship, and we're just at a low right now."
Translation into my ex's perspective:"""I always said I will not be easy for you to deal with, didn't you listen to me when I informed you of this clearly? I will give you quite a few headaches buddy in our relationship. You better stock up on the aspirins. There will be times when I am irritated with you and I expect you to fix this immediately and grant my wish or do not bother me at the very least. Bothering me and not allowing me to always have my way is something I will consider a
valley. And if you put us in this valley too often Mr. you are going to live in that valley all by yourself in a little tent. Down there you can grow crops to eat and live in your tent or sleep with your head against a rock for all I care. I deserve
peaks and don't understand why you don't/didn't get with the program. My needs are your program to follow! Do I have to print the program guide out for you? The
low right now is you are over there and I am here and you are doing nothing for me currently. But maybe you can be of some use to me one day. I'll think about it and get back to you regarding my decision."""
Just tried to answer your question. Maybe this makes no sense . If nothing else, thanks for allowing me to type it. It was a successful "venting" exercise at the very least.
AO