What happened in your case? Especially if you were 100% friends first?
I had an ex who was a friend- totally platonic- and I developed feelings after years of nothing after we got closer emotionally. It was a total change though at the time, to the extent of telling a mutual friend and her not believing me.
Although I also saw another ex recently that I ultimately rejected and thought - yeah, I did the right thing. He’s a nice guy but I’ll never change my mind.
What about you?