You know how you feel. Hurt, probably angry, you don't like the woman.
What is the life you want for yourself and your child? Think about this, about you and your daughter. Do what is best for you, and for her. Get the help you need, the support you need. Check in your area for women-child focused support groups/---Do you have family or friends who can help? Do you have a counselor? Someone who is a social worker/has that kind of background might be helpful as they are usually aware of what services are available to you. If you are dependent on this man at all financially work on becoming independent. If not, I hope you can let him go.....