Long story short, after trying to talk to my ex about separation several times, I took our daughter away for a few days and asked him not to be there when we got back. After a lot of argument, he eventually left and went and stayed with his ex (mother of his two older children).
That was 3 years ago. We got divorced the next year and he was ordered to pay Child Support, initially to me, and now directly to my daughter.
The property we owned together is currently on the market as part of the divorce settlement.
He emailed me at the beginning of August to say that the August payment would be late. He then emailed me at the beginning of September to say that he'd pay August in September and get back on schedule once the house is sold!
He has no contact with our daughter. Initially he randomly texted her and when I asked him to only text on Sundays he pretty much stopped texting her at all and makes no other effort at contact. No birthday presents or cards, nothing at Christmas, no congratulations on achievements, nothing.
I am still in touch with my stepchildren but have no other contact with any member of his family and they have none with our daughter. He blocked me on Facebook and we no longer have mutual friends, so I know nothing about his 'new' life.
When I called him out on the late CS payments and the fact that I have to tell our daughter because he won't make contact with her, he responded that I am being unbelievably offensive and have not thought about whether "something serious" might have happened to him because I am apparently "so self-absorbed that you can’t see past [my] own stupidity"
I don't think I'm being unreasonable to think he's an arsehole, but I did need a rant.