Hi all! I was wondering if anyone could give me some advice. My daughter is almost 4, and her father and I have been apart since her birth. We don't live close together, and so visitation can be sporadic. About two years ago he started seeing a new girl. She immediately started trying to be "mom" to my daughter. She has made it clear that she wants to get pregnant, and apparently thinks if she proves to the Ex that she is a good mom to his exisiting kid then he'll consent to getting her preggers.
I am not sure how to address this without really offending her (she is very easily offended, as is the Ex). What I would love to do is sit her down, explain that my girl has a mom, doesn't need another, and that being a mom to her in a clinging fashion will not convince the ex to have another kid. Maybe ask her to back it off a bit and let things go more naturally. But whenever I start to have that conversation with her the ex gets his nose in it and gets all huffy.
Has anyone dealt with anything like this situation? I have no experience with step-parents and bio parents co-existing, and have no idea how to go about making that happen without feeling being hurt somewhere.
Any advice?

My oldest daughter's biodad and I were separated basically from the time she was born as well. She's 10 now and has been adopted by my husband and has not seen her biodad in...probably five years. There was a time, though, when he was still living nearby and getting her semi-regularly. He had a girlfriend at one point and SHE was insistent that he get my daughter when scheduled. I actually was thankful, because his GF was a lot more responsible than he was and it made me feel better to know that dd was in at least ONE set of good hands. Plus, that was really the only time he actually fullfilled his visitation requirements, so it was, in all, a good thing.
However, this girl really had some mom complex thing going on. She was blond, as is my daughter, and never hesitated to tell me how when they were out, everyone thought she was my dd's mom.
ACK...I'll come back and add more later...children screaming....basically, I kind of just let it go, and it worked itself out.