Is he the jerk for not helping with groceries? Even though he paid her to do it?

I had a moment the other day that as it was happening I was thinking to myself “am I a jerk for this?” I ordered a bunch of groceries and when they showed up it started raining really hard. I didn’t want to get wet and I’m paying for the service so I didn’t help the delivery woman. I just stood there watching her through the window get wetter and wetter with every trip. Around the 6th trip back and fourth I started to feel guilty and went out to help her but by then she was already done. She was very sweet and reminded me a lot of my polish grandmother. I tipped her $5, does that prevent me from being a jerk or am I still a jerk for not helping her? Yes she’s old and yes it was raining but I paid for a service, I didn’t pay to help. Do you guys think I am a jerk for this?