Poppy, i am not in the same position but my partner (now hubby) did the same thing to me after we had decided together to start trying for a baby. He freaked out and said 'he didn't know what he wanted' i was heartbroken and had no idea what i was going to do. It took him a few weeks to get his s*%t sorted and he came back to realise he was wrong and that he needed me.
I do hope you have the same outcome. Being pregnant would make it so much harder. Sending hugs your way
and i hope it works out for you!