Hi,
So I suspect this will have a bitter tone throughout, but hey, I guess I'm bitter.
Ex and I broke up several years ago now, coming up to 10 and we both have new DPs. I am married and ex is engaged.
It was a messy split initially, but things soon settled and we buried a lot of issues for the sake of our DD. That's not to say that ex wasn't being a bit of a dick a lot of the time. Turning up hungover when picking up DD, sometimes not turning up at all, not paying CM without being pushed and pushed, but buying himself swanky clothes and watches and spending most nights in the pub, spending god knows how much! Not making a real effort with DD when he did turn up. Asking me what to do with her, where to take her and even asking if he could drop her off early because he's run out of things to do with her 
For the first couple of years, ex had numerous GFs and would introduce DD to a few, when knowing the relationship would go nowhere. One being a mum from DD's school. Classy
Then he met his now GF and he seemed to settle down.
Pretty much their entire relationship though, his GF hasn't made much of an effort with DD. Several occasions she's been too hungover to get out of bed and see DD, even though they haven't seen her for several weeks.
Over the past few months though, things seem to have changed and they have suddenly decided they want more to do with DD. Don't get me wrong, I'd be more than happy for them to make more effort and have more of a healthy influence in DD's life, but nothing has changed and now DD is nearly a teen, she's starting to blame me for everything and believes I have stopped her dad from seeing her more, when in actual fact, I have been the one to remind him that he needs to see her!
I don't want to hurt DD with the truth, but when I'm being blamed for everything and being asked why DP and I aren't as fun as her dad and GF (which basically means we don't let her do what she wants, when she wants, swear, eat junk etc) it's difficult to keep quiet about the reality.
He is "fun dad" now and I am "boring mum". Which basically means he gets on with his life 95% of the time doing what the hell he likes, with no parental responsibility and the other 5 % taking his DD to KFC, watch DVDs all day with her, whilst apparently slagging me off, so clearly this means he is dad of the year to DD.
I honestly do believe that his GF has grown fond of DD, but she is being spoken about as though she is another mum and she doesn't do anything for DD. Nothing. She now sends her the odd "love you so much baby" message, but it seems completely false. She probably doesn't even know when her birthday is or what year she's in at school.
Who gets her up for school every day? Who washes her clothes, cooks her breakfast,lunch and dinner? Who listens and helps with her problems? Who helps with her ever increasing homework? Who fights for extra help at school? Who puts a roof over her head, buys her clothes? Who worries about her safety, her happiness, all the time?
I'm not claiming to be a super mum. I'm doing my job as a mum and yes, some of these things aren't possible for them to be as involved in, but they could be doing so much more.
He never calls her, never asks me how she's getting on at school. He doesn't know her.
DD asked me the other day why I don't let her go to theirs at Christmas time (she does, just not Christmas day) and he's clearly been telling her this was the case, but in reality he wants to go out all Christmas eve and get hammered and get up on Christmas day when he liked. He couldn't do that with DD around. That would be a massive inconvenience, but I can't tell her that. I called her bluff and said that if that's what she wanted, then fine and she looked horrified and started back tracking and said that she didn't mean this year or next year. In other words, she doesn't really want to go. They wouldn't know what to do with her and deep down she knows this.
Anyway, this is getting long, so I'll stop now, but if anyone has any advice on how to handle it or can just relate, I'd be very grateful.
Thank you.