Melanthe, I don't think it will help you to talk, to be honest. Rejection sucks, but it happens, and it doesn't mean there is anything wrong with you!
The relationship wasn't working for him, and that's all you really need to know. If you push him for reasons (not sure if that's why you want to speak to him, you don't say), you will be pushing him to think of what he thinks is wrong with you. You don't need to hear that, it's not relevant to your life.
As Walk says, in time it will matter less, but in the meantime, keep up a friendly, professional demeanour.
We've got a few dates and second dates, this week, haven't we? Good luck!
Watch, is it today you hear about the house for certain? Have got fingers crossed for you.