What do you think of me dumping a girl because I might go for another girl
What makes you like her more than the other girl?
She is not so cool as the other girl
If you no longer like your partner, then you should end the relationship. It is not fair to either of you to continue seeing each other if you don't feel the same way about each other.
I was thinking of dumping her because I didn't really like her.
If you don't like her, you should let her go to be with someone who will like her. There is someone for everyone.