For a proper opinion I think we need more back story. Is he being overlly opportunistic or does he see you as really being separate?
It'd be one thing, IMO, if you two had been divorced for 10 years, and entirely if you've just split a month ago.
Probably rather shady either way though...
A mate has moved in with my ex wife my kids mum, I have two girls 10 and 11.
i find it hard to accept this, but I've been told to behave by other mates.
What's the alternative to behaving then ?, and would that alternative best serve your kids ?, obviously it's they that are the most important thing in your life right now. If I asked you would you give your life to save your children I'm guessing you would say "gladly", if you can give them your life then you take heed in this matter and try to subdue the sting this is having on your pride atm for their sake, I certainly don't envy the position you are in but if your friend is a good man then I see no reason to act negativity, although hard, try to gage the current situation with objectivity,
As 'BillytheImpaler' says, a back story would be more helpful, my advice above is based on your friend being a 'good guy' and one that would look after your kids, if this is the case then in a sense this may not be such a bad thing, I'd rather have my children living with someone I know and trust rather than a stranger that I don't, but at the same time I won't deny it's obviously still a hard situation to deal with either way.
"Im coming over to see my mate" and spend it with your lads playing raw is war on xbox instead.If you've been divorced for 6 years then it doesn't seem quite so unreasonable for your ex-wife to be going out with someone else. The fact that he is/was a mate makes it somewhat more complicated but feelings aren't always all that simple or straightforward to begin with.
Has he ever spoken to you about it? Not necessarily to get your 'permission' but even just to ask your thoughts on the matter?
out of all my Friends Andy is the biggest wimp.

Care to elaborate? you mean mentally or physically? If you mean physically then what does that have to do with him living with your kids unless they are likely to beat him up?![]()
I mean Physically, my other mates saved Andy from a good beating.
I mean Physically, my other mates saved Andy from a good beating.
doesnt matter tbh, if they want to be together he can rant all he wants it would still happen.
Maybe I phrased it badly but I just think it is polite to discuss it given it is obvious that feelings could still exist between them, it's a fairly simple case of respect. It isn't to do with ranting or asking permission, all that is needed is an acknowledgement that Privateer may still have feelings for this lady and an obvious link through the children if nothing else.
I don't disagree with the rest of your post, time will probably make it better or easier to cope with although 6 years you'd think would be a decent length of time so perhaps not.
out of all my Friends Andy is the biggest wimp, I behaved by not beating him up, but as a man Andy will never touch my kids, I suppose that's a +.