Regretting Past Friendships

So I feel like this is maybe a bit controversial.

But obviously everyone may have a romantic relationship that they regret or wish didn't happen or whatever and that's a pretty universally accented feeling.

But I feel like no one really talks about past friendships they regret. Similar to friend break ups. Like its not seen as a thing one should have any sort of feelings over.

I definitely have two friendships in my past that I honest regret to a point. Like I wish we never became as close. Cause towards the end I felt used and then I was ghosted.

Its truly effected how I approach friendships. I think ultimately in a positive way for me. Because now I am better at setting boundaries and whatnot at the beginning. Because I don't want people to basically walk all over me.

But man, if I could go back I would definitely have not been as close to them.