My boyfriend still talks to his ex. She is his baby Mama they have two kids & one on the way. He had impulsive sex with her this spring. We met beginning of August. We went on a two week trip together. His baby Mama called at least 3 times and talked a long time. She knew I was with him. The first time they talked he said he's looking forward to seeing her and the kids. That burned me up instantly. I would have been fine if he just said he was looking forward to seeing his kids. Then the next day he asked if she could live on his property with us!?! I said no way over my dead body will she live on our property. He talks none stop about her. He did admit he still loves her and doesn't love me but I'm important to him. Today he went on and on about her. I finally told him to stop it that I am sick of hearing about her and he doesn't realize how much he talks about her. I told him I see her as a threat and he even said it wasn't out of the question him saying no if she asked him to come back and he can see their kids. He never once said he would never leave me for her. I will admit he is good to me but I am highly uncomfortable with the friendship he has with his baby Mama. I told him they should only talk about their kids and nothing else. He tells me all about her problems. She even asked him to marry her when she found out he's with me. He did say I could come with him if she lets him see his kids. I flat out told him what I thought about her and I don't trust her. I know how divorced parents friendships are. My parents have been divorced since I was a baby. He buys her out of the financial mess she gets herself into. He's given her nearly a $1,000 in the past two weeks. Today he stopped talking about her when I told him I'm sick of hearing about her.

What should I do? I feel threatened by her and he even admitted I should be. Please give me advice on what I should do about this.