philosopher, I stay because I love my kids, and they need to live near a Hasidic school. I can’t bear the thought of not seeing my kids regularly. I have no attachment to the community. Even when I occasionally take my son to shul, I don’t go to the shul I used to daven at.
Over the past few years, I got to know many others in mixed marriages. Often, if the marriage itself is fine, and the frum spouse feels it’s not an averiah to live with a non-frum spouse, they will try to make it work for the sake of the kids. Some will even try to make it work, solely because they love each other.