Is this a serious question?
I'm not going to tell you to dump the guy because he's a loser.
However...
I will tell you that, in my personal opinion, he's a loser; and if I were dating him, I would dump him.
If you are going to decide not to be his girlfriend for a year, you have to give up cuddling with him and all of that. No special touching or dates. Treat him as you would all of your other friends, or else, he will end up getting in again.
Plus, if you're going to do that, you might as well just let go. He can't even be loyal to you when you are together and pregnant. What makes you think he's going to be loyal to you in this so-called "committed break-up" for a full year?
He's going to move on.
I don't want to scare you into taking him back, by saying that. Rather, realize it. Accept it. Know that it's for the best.