Legally, he can't take you off of the insurance until your divorce is final. I don't know about the discount card where he works, but, benefits remain in place until a divorce is final.
Sadly, a formal agreement regarding money, vistation, etc, almost always needs to be in place. Emotions run high and low during these times. No matter what anyones intentions are to begin with, money, etc. ends up being a weapon, is used as a punishment. With no formal agreement in place, it just ends up in a mess.