What's my problem?

You know what pisses me off? Me.
Gaming late tonight. About 2am I shut the game off and when I took off my headset I heard yelling and cries for help. This area I live in that is always happening. Drunk people or shitty people just yelling. So I tried to ignore it but it kept going. after a moment I went to the back window and saw a man beating up a woman. Full fists. Even shoved her into my moving van. I went outside to yell at him to stop but as I did she managed to get away but I saw him following her. I went to get my phone and when I got back They were gone but I could still heard her yelling. I kinda froze. I just stood there with the phone in my hand. I wanted to call the police but when I would go to I would just stare at the phone. I heard a siren WOOP and it sounded really really close, so I thought they found them. A few minutes pass then I went to sit in the living room, looked out the window, and there he was, at the corner shop buying a beer. I didn't see the woman. I picked up the phone again, tapped 999, but then just stared at it. I watched him buy his beer, talk to his friends, then walk away. Now all I can think about is is that woman laying in the alley? Did she get away? Is she ok? Why didn't I call the police? I even thought about going outside to walk down the alley and see if she is there, but I'm scared. I guess I have good reason to be at this point. Actually the whole time I have lived here I've been scared. This shit happens all the time, almost daily. But never this bad.

I'm so glad I'm moving today.

I hope that lady is ok.

I feel like shit.