<human>: Can you provide a brief rundown of the text in within 3 sentences?

Hi guys, 

I've noticed that whenever theres an argument, something doesn't go her way or something gets in the way of our plans she gets very mean towards me.

Ex. I told her I'd possibly be able to pick her up today after shes off work but only if I had the car, I'd let her know if I did once I was home.

I got home, no car, texted her immediately. She didn't respond 2 hours later (I had taken a nap after a long day of work in the mean time) which is understandable because shes working. 

She gets off work and says "I thought you were coming so i told my mom not to come pick me up. Why didnt you tell my mom you weren't coming? Shows how much you care." 

There was another time where I had offered to pick her up and couldnt and had texted her sister that i wasn't able to. I had let her mom know about that. Thing is then I had told her I was going to pick her up for sure but my car wouldn't start so I couldn't and had told her mom. 

That last bit hurt quite a bit. I do a lot for her and when something like this happens (It rarely happens) she makes these generalizations about me. How do I go about talking about this with her?
<bot>: Couldn't pick up gf and told her, gf was upset that I couldnt come and said "Shows how much you care". How do I deal?