The answer to every question about his behavior is this--
because he is an alcoholic. There may be other reasons as well, but unless and until he finds long-term sobriety it will always be the reason.
Originally Posted by
heather59901 
If the children are the reason for coming by, why doesn't he stop and ask to see them? He has driven by multiple times but hasn't even stopped by to get the last bag of clothes I told him he has here. I also asked him to have his mail forwarded to his new address. He said he would and would pick up the clothes and hasn't done either. So I guess with the kids he would have a reason to be around here except he isn't trying to see them.