Basically, he now says that his R. with o.w. is not making him happy. That since circumstances have changed (she's not pregnant), he decided after thinking long and hard, that he does not really want to live with her... it isn't making him happy at all.
Now he wants to find someone new; a fresh start. He told me he wants to find someone that likes all the same things he does; shares all the same hobbies (like biking, running). He wants someone "better for him" as he put it.
And so he still thinks his happiness will come from someone else.
And when he finds someone that likes what he likes, he'll find that similar interests still won't be enough. Poor guy.
This is good, though, Hope. His relationship with the OW was taken out of their fantasy arrangement that he had while living with you, and made real since he left. And he found it didn't work as he thought it would.
Still searching outside of himself, he now seeks another person. He'll have more realizations as that doesn't pan out to meet his expectations.
But that's his journey, not yours.
He is not in love with anybody right now. Not me; not her.
And dare I say, also not himself.
And he can't really love anyone until he can first do that.
Spend time with your family, have a good time with them, and do some good things with yourself, and mourn your loss. Don't grieve too much, like you would with a loved one's death, but grieve accordingly as befits the breakup of a relationship, not excessively, lest your grief serve to give you more grief.