Seeking Guidance

I'm a 33-year-old female and recently reconnected with a friend who's 34. A few years ago, we dated for about nine months, but he wasn't ready to make it official, which led me to walk away. That really hurt me, especially since he had expressed that he didn't want children, while I was still undecided. When we reconnected, I was in another relationship that lasted eight months, so I thought it was best to just be friends. I even considered setting him up with my best friend, who is also 33, believing it would be a good arrangement since both of them seemed interested. I mentioned that my friend wanted kids, and he told me he was open to that now. When I asked about his previous reluctance, he explained that he wouldn't want kids with someone he didn't think would make a good parent (that hit hard). After my breakup a month ago, we ended up becoming intimate. However, I had promised my best friend that we could all move in together once my lease ends, and she has no idea about my recent connection with him. While having him back in my life makes me incredibly happy, I can't shake the fear that he might still be hesitant to commit. Why did he avoid a serious relationship back then, and what has changed now? Plus, I can't help but think about how he considered dating my best friend only a few months ago and was willing to have kids with her, but not with me. What does this mean for our living situation? I would really appreciate some advice on this.