Sounds to me like you're very co-dependent and expect him to take responsibility for your issues and happiness.
You come across as all 'me me me' and very needy.
I started seeing this guy a couple of months ago but then you say we've been more or less in a relationship for a year
Make up your mind - which is it?
it was the first I'd drank in ages hence why I ended up so drunk
No - you ended up drunk because you chose to keep drinking alcohol. You had the choice of switching to soft drinks.
I could have been anywhere drunk and in a different country and he simply just didn't give a fk*
He was drunk too, had just been in an argument with you....and he doesn't owe you anything and is not responsible for you
You say What's the difference between taking your kids on holiday and dragging them away as this is a holiday for them and also say I'm just sitting about all the time completely alone
If it was a holiday they were on then you'd be busy focusing on them.
With it being the summer holidays me and my kids are staying at his for a few weeks
This 'holiday' is about you getting to spend time with your man - your kids don't get a choice about coming along for the ride.
He's so quiet and reserved all the time...he says "im an introvert" "you knew I was like this "
So you do know AND he's told you what type of personality he is....but you ignore this and expect him to get caught up in your drama.
this is also probably why he chose to go to bed after the drunken argument instead of coming after you when you decided to stand outside for 2 hours.
he said he is scared to get me pregnant even tho I'm on birth control and he never finishes inside . I call bullst
You know full well no contraception is 100% effective and you could end up pregnant if it fails.
Again - he's TELLING you why he's being like this and yet again you're ignoring this, choosing instead to twist it into something else.
To put it bluntly - you're a mess. Your life's a mess.
You need to take responsibility for rescuing yourself and improving your self esteem - not expecting a man to do that for you.
Since your ex, what have you actively done to address these issues in the longterm?