My girlfriend ghosted me earlier, so I went out on a date.
Why would you date someone else just because your girlfriend ghosted you?
I didn't like that she did that to me so I made a change.
While it may have been annoying that she didn't respond to you in time, you shouldn't be cheating on your girlfriend. She could have been busy or going through something and that breach of trust you just did was a terrible thing and you probably will lose her now.
She's not worth my time if she won't be devoted to me.
You shouldn't act so rashly just because your girlfriend ignored you. It was likely just due to a situation she's dealing with and not how she really feels. Try to wait for her to respond to you before going out with someone else.