I agree w/AJ, you need to have a conversation w/him. Can you call him and ask to meet w/him? Even though the children are both yours and his, please have a Plan B in place just in case he is unable to take care of them.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
