DH and I have been together since his DC was a baby. My SS, who I love and am VERY close with is now 6 (we met when he was 3 and DH and I became very serious about being together). In the years we have been together, I can count the times I have spoken to his Ex. And it has only been brief and friendly. Now, she is a biotch, cuz she will call DH and pi$$ him off with all kind of dumb crap. BUT, DH keeps me away from it. She does not have my house number and any issue she has, she must contact DH thru his cell. It is SOOO much better.
I was in a relationship long ago where the guy had kids and the momma was always calling and cusing and driving me crazy. I really have no use for anyone's BM. We are civil to eachother, but in my eyes, its DH's issue and he should deal with her. Not me. Thats my tip.
Re: a tip
Definitely a good tip. I have not met BM and I've been with my FI for 5 years now. They live really far away so FI goes up there to get the kids. She sends me messages on myspace, although we have not friended each other and both our profiles are private, basically for administrative stuff (she sent their school pictures, I sent their birthday presents, keep an eye out for UPS and let me know if it doesn't get there etc).
Right now she and FI are pissed at each other and it's definitely nice not being involved.