Well done breathe! No, you are not destroying everyone. I got told I was ripping a family apart. It is all very emotive and you need to don a hard hat and ignore. When I look back at what went on in my marriage and indeed, in the aftermath of the separation, I am actually appalled at how much I had normalised what was actually quite awful.
To use less emotive language, yes, my decision, based on his behaviour and our inability to reconcile our differences and my inability to cope any longer, took our family apart. It was very painful, in some respects, it is still painful. However, that decision also allowed us to reconstitute our family into two parts, or two separate families. This has allowed us both to be parents and live our lives with a lower level of conflict, which noticeably has benefitted dc.
I say lower level of conflict because I realised that the dynamics of the marriage had simply become the dynamics of the separation but with more distance, if that makes sense. So, I am also having to change myself and the way I react to get it to stop.
It is also the case, as Charlotte says, that separating has brought out the good dad in him. Some of what he does is quite controlling, and as dc get older, there may be issues, but in terms of time and effort, it is unrecognisable from what went before. It is very, very difficult in some respects because you think a) if there had been that level of engagement before, perhaps we could have worked things out better, and b) he didn't bother before because he was happy for me to run myself into the ground so he could get on with his life; and actually, 90% of the time now, he is totally free to get on with his life and therefore happier.
Not sure if that helps, but you are not destroying everything. If I look back, it was horrible, and if you take on board the emotional blackmail, you are just giving yourself one more thing to deal with. All the best to you 