Thanks for your letter. It sounds like things are tough for you at the moment - it's never easy when parents split up and I'm glad that you've written to me for some support.
It can be hard to deal with when one of your parents gets a new boyfriend or girlfriend and it's never nice to hear someone talk badly about someone you care about. It might seem scary talking to your mum's new boyfriend yourself, an idea might be to talk to your mum about it and ask her to talk to him for you?
Sometimes it can be easier to talk to someone outside the family about what's going on. You can always call a ChildLine counsellor either by phoning on 0800 1111 or logging on to 1-2-1 chat. You also might want to check out our message board to ask some other young people for advice. Other people you might feel comfortable talking to are maybe a teacher or a close friend?
A website you might find helpful to look at is www.itsnotyourfault.org.
Hope this has been of some help.