Just hopping guy to guy 🤷

So I'm in the process of a divorce after being together for three years. We don't hate each other, neither cheated, we just weren't making each other happy for awhile now and decided it was best to end it, we're still close friends. I have a son from a previous relationship and since my ex husband was always the father figure (baby daddy isn't in the picture) we've been splitting visitation. For a few months before we called off our relationship we were in an open relationship. We were both 100% okay with it and it never caused any issues and no, it's not why we split up. My last sexual partner before the split up, I'll call D. Me and D have been hanging out alot recently and I openly told him I'm not interested in anything serious because I JUST got out of a marriage. We're trying so hard to take it slow and it feels impossible. We both ended up crying, holding each other because it just feels so right. He's amazing with my son and it's like everything about us is identical to each other. It's making it so hard to take it slow. Yesterday, we were laying together and he looked up at me and said "I love you" my eyes went wide and he had the face of *oh fuck what did I just do* and he said "i-i mean I love spending time with you". I'm so shook up and confused. I'm not ready for this commitment, I just got out of this but it feels impossible to not want to be with him. I don't wanna hurt anyone, I don't wanna confuse my son. I don't know what to do to slow this down. Help?!