C.S.
Hi there. First of all, congrats on your baby and I'm sorry this man did this to you. With a newborn, you should be breastfeeding and will probably be breastfeeding every 1.5-2 hours a lot of the time without a real idea of how long you can leave him/her without him/her wanting to nurse. If you are having trouble with latching, you will not want to introduce rubber nipples (i.e. bottles of pumped breastmilk) which can exacerbate things. Please do not give your baby formula just so he/she can go see dad and his new wife for a few hours.
Frankly, I would tell him that right now you are focused on what's best for your baby and since you are nursing the baby cannot be away from you. He can see the baby while you are present or he'll have to wait a couple of months until the nursing schedule is more predictable and/or you can send the baby along with a bottle of pumped milk. Good luck and I'm sure you will do great on your own with your new babe!