If, when we left them, they would "learn to self-soothe," that would be super. But that isn't what happens, is it, generally? They just find new people.
That's why I think it may be a fallacy that we are helping them by leaving. It's a nice thought. But I'm not sure it makes sense given what will almost inevitably happen next: they get a new external object/source of soothing.
My exH remarried about 8 months after our final break-up. That was a year ago and he seems a lot more settled and happy. I have as little contact with him as possible (because I am now triggered by him!) but hear about him from friends and our children. I find it really hard that he seems to have gone from being so miserable and angry with me to a new, wonderful relationship weeks later that is, by all accounts, still going strong. It's difficult not to take it personally at times.
I do, however, feel that he is better off being away from me because we were triggering each other so much latterly. He came and went several times over years - things would be great and then flip. My theory is that the more he caused pain, the more shame he felt and the less he could handle it... . so he left again. Or he would remember something I'd done that hurt him 15 years ago and he'd be off. He did the same thing with another woman over a few years and she was utterly confused when, having finally divorced me he then married a third woman. I found that painful but not confusing - there was no history with the new wife and so no triggers.
So I agree with P&C - I can say that he's "better off without me" but, sadly, I wouldn't bet my mortgage on him being better off overall. He's not been out of a relationship for more than 5 minutes and got married within six months of starting to date new wife. Part of me hopes I'm wrong - I still care about him and she seems a decent woman (the other part of me isn't so generous )
I want to say something like "the best thing... . would have been if I'd been more aware of my boundaries at an early stage in our relationship" or "the best thing... . would have been for him to have felt good enough as a child" or "the best thing... . would have been for me to have been the one to end things years ago" but as Tolou says, we can't change the past and so I will have to take what I've learned into my future.
Control is what I think of when I thing of letting go - no longer controlling the outcome or the pain.
When I think of letting go now (over 18 months out of relationship), I think about letting go of understanding our relationship and what happened. I still seem to need to do this and it's futile!
take care,
Claire