While I admire your capacity for forgiveness there are dynamics within your family that require you to see the reconnection from their perspective in order to maintain the balance.
If you think of the family like a mobile hanging from the ceiling each person in the family is affected by what everyone else does. When your husband checked out, it was like putting a 10 pound weight on him that profoundly threw off the family dynamics. When you divorced him it was like cutting that weight, and your family, out of the balance.
Over time, everyone has adjusted to each other without him being a factor. Reconnecting with him, almost by definition, will throw the balance off again. Your daughter’s request for you to not see him is their attempt at bringing the family back into balance as it was. Since you’ve reconnected with him there is an on going problem with the dynamics. The struggle now his is how to honor your need to reconnect while honoring both your daughter’s.
I highly recommend you and your daughters make an appointment with the family therapist. Here’s a link to a highly regarded association. It will help you find someone in your area. I believe this is very important. To just stop seeing him because of your daughters request alone without a mediated discussion may create more difficulties for you downstream.