What can i do to keep an ex-boyfriend form harrasing me?

If he is threatening and harassing you, you can always get a restraining order, but it sounds like he just wants to see the kids. He has been their father biological or not and now they have been taken away. That can be heart breaking. He can file for visitation, but usually it take a lawyer to help if he is not the biological parent.

Try to work something out with him and take the kids feelings into consideration as well. They probably miss him too.

He started all of this when the kids father wanted to have visitations with them. He went and got information on the childrens father to try and prevent him from seeing the kids, and having anythng to do with them my ex feels that becouse he does not have money to buy the kids presents and anything that they want, then that makes him worthless to be a dad to his own children. I have tried to come to a compromise with my ex, but he will not relent.

What a hard spot to be in. Well, I think that they both have a right to be in your children's lives. How old are your kids - this could be very hard on them and confusing. He can't prevent the biological parent from having rights either.

My ex feels that becouse he was not around for about 8 years that he should not have rights.
I am afraid of the emotional damage that my ex could cause for my children.
my children have expressed that at time they do not want to be around my ex especialy when he drinks. He fells that i should tell the children the truth about their father and let them decide. My son is 11 and my daughter is 7. I feel that they are too young to understand.

here is the story about my son: his father was into drugs and becouse of that he got into some trouble that does not allow him to be alone with my daughter.
my daughter: her father raped me and then threten to kill me and my son, i did not tell him that i was pregnant with her when i left.

I am afraid that my ex will tell my children about my past and that of their fathers and the ramifacation of that.

my sons father is taking care of his past mistakes. so that he can be around the kids, but my ex does not want that to happen.

Was this guy your kid's "dad" for a while?

He probably still cares about your kids, and really wants the best for them. you just have to decide if having him in their lives is best for them.

If you don't want him around, you might need a restraining order.

He spent the last five years telling the kids that he was not their dad and telling me that he never wanted kids. and now that their father is back in their lives he wants them.

I have called the police and that is what they have said.
thank you for your help and letting me talk with you.
I realy appriciate the help