My first ever AIBU and am feeling a bit delicate about this so please go easy 
Basically me & H split up (my doing) 2yrs ago (we got divorced last mth) due to his mental health problems & drinking....
He has gone back to Ireland (where his family is from) and I am in family home in Middx.
Since he left he has seen DC 5 times and the last 3 times have been awful
He has got so drunk he got arrested at airport and not allowed to baord plane home (he spent night in police cell and my parents had to fork out money for another flight)
Another time he got v drunk at my mum's house (she let him stay there as he is not working so cannot pay B&B - she did it for DC not H iyswim) that he was not fit to look after them...
He does not engage with them at all and they barely know who he is 
He is supposed to ring every friday to speak to DC but the last 4wks has not bothered apart from one drunken call on a sat morning and I refused to let him speak to DC.
So basically I feel that I/and my family have done everything to maintain a realationship between him and DC and it has been flung back in our faces. (His family don't bother either btw and have not called once in 2yrs
)
AIBU to now let things fizzle out and make a new life for myself and DC which does not involve their father??
DC are 5 & 3 BTW...