Hi TEAINNEED,
Just thought I'd let you know you are not alone! I'm a single mum too and have similar problems.
My DS (3yo) has always been a bit naughty but since starting pre-school a few weeks ago he's been a nightmare, very aggressive.
I had a meeting with his teacher as he had hit a little girl, I was so mortified I ended up crying, which was even more embarrassing!
They have started a 'smiley face book' with him, and he has to get two smiley faces a day, if he does I get him a gingerbread man - he loves them and they are ideal as an everyday treat, even going into the baker's and giving the lady the money is all part of it for him! If he doesn't he doesn't get his TV time and also is limited to one bedtime story instead of 2 or 3 (can't bear to take that away altogether as I think reading is so important, especially with boys).
If he gets 2 every day for the week we do something different (e.g. not the park or kids am at the cinema as they make up a typical weekend!), for example yesterday we went to the Natural History museum to see the dinosaurs.
It does seem to work in the short term in that he behaves to get the smiley faces, but he doesn't always get them and the good behaviour doesn't last.
His other big problem is spitting which is a fairly new thing - used to be biting but seem to have got over that using 'naughty step'
I also tell him I don't want to talk to him until he can be a good boy and will not speak to him or reply to anything he says for ten minutes - this drives him mad as he loves to talk about anything and everything and I am a single parent so he is a real mummy's boy and hates it when he doesn't get attention from me. However again not long term, he will say sorry then do the same thing again 5 minutes later. He also doesn't discriminate between adults and children, will spit at/hit/kick both, including me.
We have long chats about why he should do bad things but he still does - He knows right from wrong which makes it worse, if he didn't realise that it was wrong maybe that would be easier to understand!
I know for me the probable causes are that I work full-time and that his father chooses not to see him (he left me when I was pregnant and has only seen him once since he was born).
I will say, my son is with a childminder (who is ABSOLUTELY fantastic) 9-5 mon-fri so she takes him to pre-school and picks him up, and for the first couple of months with her his behaviour was bad too, so part of it may be related to change, it's quite a big deal at that age and it's so much like school that they just aren't used to that sort of environment (which is why I put him in there!) and at least if it's happening now hopefully the problems will be ironed out before they start school.
As for the aggressiveness I don't know where it comes from with Ben, he doesn't see any violence at home and his TV is time-limited and content-limited so I just don't get it. But I do know how you feel!
Maybe you could ask your ex to get one of the educational games consoles for kids like the v-tec one, he could tell him it's his new one and hide the playstation when he's there? Then he's still playing computer games but they won't be doing any damage?
BTW, my son tells me he hates me too, whenever he doesn't get his own way, so don't take that to heart, I think that's just a kid thing - how can I hurt mummy the most?!
The best thing we can do is maintain the two-way support with the pre-school.
Sorry just realised how much I've been rambling on!
Good luck with everything