When I'm pregnant My poor OH really gets it for 9mths!!! Perhaps your worrying now that it's done, even if you still think its the right thing.
So it's an emotional time, really think about the real reason that you finished it and if that still applys and on reflection you feel it's not an over reaction to things helped by the preg hormones, and still something that you believe is worthy of finishing this, then maybee you should see how things go without him for a bit? I would keep in touch for the baby sake if possible and leaves the door open later on perhaps. Or if you feel that if is something that could work still , go for it speak to him, blame hormones and emotions.
Good luck X