I am unsure how to reply to this but this could potentially be a future scenario for me.
My stbexh has left to live with OW, at present I live in our rather large family home, it is up for sale.
My DC have left home but not financially independent yet.
I have a low paid part time job and couldn't possibly support myself even if I increased to full time hours. I have been too long out of the jobs market, as I have always looked after the DC.
We are agreeing at present the division of assets and maintenance for me. This will continue till I retire and pension kicks in.
My H knows that I will always be financially reliant on him and accepts this, I have been told that OW is aware of this situation also.
I know the situation is different, but my life has been changed for ever and my standard of living shouldn't suffer due to his choices, not mine.
What I am trying to say, is that I would hope my H honours his financial obligation and commitment to me in the future and that OW, should they remain together, realises this.
Are you resentful that your H is helping his DC with honeymoons? I think this is a very lovely thing to do, they are his children, why shouldn't he. They should remain his priority, I would be disappointed if my DC were not my H's first and foremost.