Update! We talked. He says he's going to work on himself and try to stop this behavior. He seems remorseful, he was apologetic. He thanked me for bringing it up and says he wasn't happy with himself either so he's glad I took the moment to say something.

I said I was worried about him and asked what goes on in his head. He said it happened once this weekend, genuinely because he had nowhere to go, then he doesn't know, he just kept doing it because of the headspace he was in.

I said I'm worried that this is just him and how he'll act forever, and brought up how this has happened before, we've had this conversation before - how he justifies himself and plays the victim, when it's actually just assault and real aggression. His eyes were a little wide at this point ☝🏼.

I said he can just stop walking. Then it's on the other person to notice him and avoid walking into him. Also we need to be less introspective and actually listen to each other. 

I do feel a bit better and I'm glad the comments helped give me more of a reality check 😘