Carolyn Hax: A husband helps his ex manage single motherhood, and his wife draws a line

Adapted from an online discussion.

Dear Carolyn: My husband has an ex-girlfriend with whom he has stayed good friends for the 10 years since their breakup. (She refers to him as being “like a brother.”) She is now a single mom and doesn’t have much of a support system. The baby’s father is not local.