Need advice

So me and my ex dated for 8 months and then we broke up. It has now been 7 months since we broke up. But we still have talked every single day and still do till this day. We do still hangout every so often. And yes we do still sleep together and haven't with anyone else. We have talked before of how we felt and I was still in love with him but he said he didn't feel that way anymore and that was probably about 2 months after we broke up. During our break up it kind of ended up being mutual during our conversation when we're breaking up. Yes he was breaking up with me because he had some insecurities and he didn't feel like this is an appropriate time to balance a girlfriend and his life priorities. But we still remain friends if not almost better friends. Now here we are still talking. we talked about it again recently and he tells me that no matter what he will still love me and he can trust me more than anything and talk to me about anything but he just always needs his space.  And he says that we obviously have something just have stuff to figure out. I just don't understand what this is supposed to mean because I still love the guy so much. We plan to talk in a couple days about where our relationship will stand, but I just don't know where to actually start in a conversation when we go to talk about this. It has been a long time since we dated almost been about the same time it's been that we dated for and now we both have grown and changed.  But how do I start in a conversation with him about everything? I personally don't know what to say or where to begin. because we know each other it's not like it's a new relationship. But for us to prove we've changed to each other and that it's not going to be the same or end up the same as before. How do I put that into words to help him understand I'm doing this change for him and our future.