I want to leave my girlfriend at the supermarket
That is an unkind thing to do. Have you discussed the relationship with your girlfriend?
No, I'm not that kind of guy who has to talk about such things, you want to know the truth just ask me
It can be hard to talk things out but you cannot ditch your partner at the store. It won't fix the problems in the relationship and it might make things worse.
I just wanted to leave her.
She would be upset and embarrassed if you left her there. You care about her, so you shouldn't ditch your partner. Take her home and try and communicate your feelings to her.