It's the 1st anniversary of my Mum's death this weekend, how I wish I'd known about MN then...
I have a long back history:
www.mumsnet.com/Talk/relationships/a1345595-AIBU-to-not-take-back-ex-H-thats-threatening-suicide
My Ex-H was an alcohol dependent EA, cheating bastard to me in the 18months I was nursing my terminally ill parents 
I left him, cut most contact & he has our 2 DS's every sat 7pm til Sun eve 7pm.
Mostly this works fine, I still occasionally get the drunk/abusive- you don't give a shit about me texts, but ignore them all.
We both work full-time, he has never given me a penny in the 18m we've been sep, in fact I have 'lent' him hundreds in that time (due to him constantly making our old joint acc o/d) & always send DS's with a hamper for their stay.
With it being DM's anniversary on the 18th, I had long ago agreed/arranged with other elderly distant relatives we would get together this wknd to 'remember Mum'
What I only realised a few weeks ago was it was also Fathers day.
My DD 18 talked to her Dad, explained/asked was it ok for him to return DS's a bit early so they could see relatives. Ex agreed. (MIL went mental, but that's another story).
I heard today my VERY elderly relatives are in fact too poorly to travel tomorrow, so text Ex-H & said we could revert to original arrangements... he text me thus:
"I've been really busy at work & am completely fucked will drop them back at 12 as you requested."
I actually really hate him right now & am having to really restrain myself from texting him to fuck off out of my children's lives, who NEVER ask about their 'Dad', who deserve better than an asshole who would rather play mind games with their Mum because she will be reflectively grieving this wknd & not thinking about him. 
Please tell me to ignore him.
~I'm so tempted to pack the tent & disappear for the whole weekend now.