I think you handled it well and you are on a good track. Men often back away a bit when they feel a bit pressured or aren't quite ready - and by being open, he realised he didn't need to worry and back away. If he didnt have some feelings, he wouldnt have come back to you.
I wouldn't worry too much about his previous relationship - the right person can make you forget all about an ex and all people get over things at different rates. 6 months is certainly long enough for some people.
Personally, I would continue on the path you are, and maybe a few months down the line, have 'the conversation' to make things official, if you havent got to the point already.