If' I've learned anything in all my years on the planet about men, FROM men, it's that they say what they mean and there are no having to "decipher" it assuming it means something else.
WE women say things and they are metaphors, analogies, innuendo, etc...with multiple meanings, like a quiz...and we want to see HOW the guy will answer, which allows us to make assumptions on what he REALLY said...right? (are you smiling/laughing...you KNOW it's true! haha)
What he meant to say is just what he said. He wants to take it slow because of his recent history.
What that means to ME, is that you don't want to go all dating ninja on him and require a lot of calls, and emotional attachment right away. DON'T ask where your relationship is going, DON'T suggest meeting each others best friends, or family. DON'T initiate going away on a weekend together...DON'T buy him anything...all of these things might drive him away if he wants to take it S- L- O- W...
I'm usually the one screwing stuff like this up...assuming if one call is good, 3 is better. But it's easy to see on the outside when someone else is exposed.
One of my friends suggested to me (and I'm paying it forward) that you should "respond in kind"...which means that if he texts you and says "hey, hows it going?"...you text back "hey (or hi)...its going great!" That's it. Don't call, don't go into 21 questions...just keep it on the level he initiated.
If he calls and jokes around, joke back. But if he doesn't ask you out on the phone and just wants to chat, don't ask him out, but rather try to be the first one to "need to go", but nicely...and make him work for it.
He will subconsciously see that you respect his space, and having assumed that you are (yet another) clingy woman like the last one who hurt him, he will have his guard up, but will start to let it down when he realizes that you're not a crazy girl like "the last one".
I KNOW waiting for the call, the date, the hint that he even likes you is the longest wait EVER, but it is what a relationship with this guy will be about.
I would also advise that you not lock in on him, and keep your dating options open...never know who might appear while you're waiting for this guy.
good luck to you.