Boyfriend lives with baby's mama. Am I the other woman?

Anonymous
My boyfriend asked his baby mama to move in with him years ago to maintain his house, while he was deployed back to back for like 3 deployments. Yet she is still there and he claims he's been telling her to leave for a long time. He claims he doesn't want to rock the boat because she'll take him for years of child support. We've been together over a year (yes I know, I know) and she still lives with him. She doesn't know about me. Should I believe him about the child support, (he supports his child but doesn't want to be taken to court for years of back pay). We now have a child together (unplanned pregnancy). When I showed him the laws in our state and explained she couldn't "take him" for years of child support (especially since his child has lived with him for many years), he said he didn't want to hear it and that I didn't know what I was talking about. He's generally OK, and good to my other two children. He's not abusive. Myself and my kids have had such a rough road, I'm fearing we should just take what we've got. At least he doesn't beat on us. No man will take a woman with three kids.. I'm afraid to leave this guy. My children need a father, and as long as he's good to them- that's all that matters right? I'm a real idiot because he told me about her in the beginning, but if I had realized that I would be a secret and that her family still thinks they're an item(found out that last one at 6months pregnant) we'd still be in this same spot- I would not have stayed. Now I care so much about him, it hurts and I have been crying since I was 4 weeks pregnant.- now my baby is 3 months old. Please tell me what you think!
Boyfriend lives with baby's mama. Am I the other woman?
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