I've been browsing... wow, I started this thread over 3 years ago! Looking back, my H was definitely a Boomerang, not an on-and-off at all. It was odd to read my first post, and to think about what has changed. Until a year ago it didn't seem that much had, except that he had initiated legal action, saying he was now happy with OW5 and wanted to move on. But certainly no more mention of friendship. And now OW5 may be a question mark.
The thing that seems to have changed is that he is now angry, angry, angry. He has been contact much less for the past year, has stopped coming here at all and now only sees D; boys aren't interested and he is angry about that as well, saying that they should treat him better. Small amount of contact with me when his mother died last year.
He now openly blames me for everything to the kids, something he didn't do before. And he no longer contacts me about the kids at all, texts D16 directly, sometimes boys, but they generally don't respond. I've asked him not to put her in the middle between him and her brothers, but now also see that that comes across as controlling/lecturing. But that really isn't fair on D, and she does need to know I've got her back.
He now appears to be using D16 as the person to talk to when things aren't going well (they aren't now); that's what he used to do with me in previous cycles. D somehow knows that this isn't appropriate, but also says that she doesn't really know what to do about it, and she is too afraid of losing him for good if she doesn't go along with what he wants.
I guess he still counts as a Boomerang, even if he is not in touch nearly as much as he used to be. He is in regular contact, but directly with kids rather than with me; I've only got the angry stuff, first through lawyers and now directly.
Weird to look back on it.