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Thank you all for your replies. Sorry it was so long - it was twice that length originally and I had to edit it! I had to try and get all the facts in though.
Metalwoman, our situations sound almost identical. My ex didn't bother with my daughter for the last 6-7 months of our relationship and she hated it when she was left alone with him when I went to work. Then like your ex, he suddenly became interested once I'd left him. He then became this great guy who would buy her a Mcdonalds every week and take her round his mate's houses to play with their kids, so to her he became 'fun'. Then the calls got less frequent and she was seeing him about once a month and he stopped feeding her - couldn't afford a �2.25 happy meal apparently, so she was coming home at 9pm on a school night starving.
So, I put a stop to that and he hasn't seen her once this year and didn't buy her a Christmas present so I hoped that would be it. He phones her every now and then for a chat, which was fine with me, until I found out that he's interrogating her about our lives, so it seems to me like yes, he IS using her to get at either me or bf.
My bf is more bothered by the fact that she has still accepted a present from him despite knowing all the lies he's telling, knowing that he hit me (and witnessing it on one occasion), knowing that he tried to fight bf, and understanding that it's wrong for him to tell her to keep secrets from me. I agree with him, but also understand that being a kid, of course she's going to accept presents! He can't see that though.
I told him he was being childish and very selfish especially as it was her Birthday. She had a great day anyway thank you k8bailey, bf didn't talk to her unless she spoke to him but she didn't let it spoil her day. She's so confident and she just let it go over her head and enjoyed herself.
Thank you again everone. x