My ex was exactly the same
Stayed out all night, came home 7am next morn(because she was on early shift) and wanted to go to bed he was tired! Wtf
I wasn’t as wise then, so I rang his mum to tell her
She came round and took him(s grown man to there’s)
Ds was crying (4) because he saw dad with suitcase and he wanted to go to the beach as well! (Thought he was going on holiday)
Would only ever see him when she was on shift so fitted around her
Ds was the last in the picking line
And then he was taken to his mums so she could look after him whilst he prob sat on his area watching football
Told him to f.... off, no way does ds come last
Ds went in hospital for op at 5
Didn’t even come with us, said he was working. I rang his work he wasn’t in!! I was fuming
Turned up next day, with soft toy and I let rip on him
Didn’t even carry him down corridor to get taxi home
Don’t get me started on the horrible things he did. The other woman and him were leading a singles life (no kids) and I was left with all decisions/child care etc
I actually preferred it after a while, no hassle, arguing and promises that weren’t kept
He’s spineless
He’s keeping away because he doesn’t know who to chose YET!
He’ll say he’s been sorting his head out. Lol
I wouldn’t even text him, no you can’t change the locks. But if you have alarm change the number 
For the time being tell the kids daddy’s as gone away with work for a while. And they will see him when he get back.
Be kind to yourself, try not to think what the spineless t... is doing
As that will grind you down no end
I know it’s hard.
He obviously knows the timings of when your out, prob sat waiting in a road nearby.
Put the other things in black plastic bags and leave outside
Then send text, come and get them
Hugs to you and the kids x