Is he co dependent and unhealthy?

I (21F) recently turned down this guy (23M) I’ve been friends with for a couple years. Things got more intense and he was very clear about his feelings but never actually stated them to me. He’s a great guy, but I put down a boundary of distance because he would constantly text me. When I wouldn’t answer in like a hour or more, he would text multiple times and then send messages in other places. A few times he thought I was mad at him. But I was trying to keep things from moving too fast. I felt pressure to always keep him from getting “too much”. Also my brother(his close friend) said he’s had emotional and anger problems in his past relationships. I liked him, and wish it could’ve worked out, but I felt like I was emotionally babysitting. Thoughts?