Vance is right, when you love someone you don't just meet someone new so quickly. Honest opinion, if your ex wants to be with you, he will and not say "we are on a break" and dangle you on a string and leave you with hopes or reconciling. The new guy, sounds like he's playing the game. Most likely to get in your pants. However, the longer you wait to be intimate with him, the quicker he will show his true colors. Give him and yourself a chance to get to know each other. Don't use him as a rebound.
Why did your ex-want space? Do you love your ex? Do you want to be with him? Dating someone for over 1 year and then breaking up and you meeting this new guy, well it sounds like you really don't have that much to give the ex. What I mean is it sounds like you were either with him because you felt like that is what you were supposed to do or because it was confortable. It does not sound like you are in love with him.