I still want to sleep with another woman
I don't think I would condone that. Why do you think you want to sleep with a different woman?
I want to sleep with her because I'm not satisfied with my gf
It is normal for relationships to go through things but cheating on the person you are in a relationship is wrong. It will hurt them and hurt the relationship.
I'd rather get to know another girl than to be tied to one.
That's the definition of cheating and having multiple relationship that is sexual is not healthy as the people you will cheat on will be hurt and will probably break up with you once they find out. I recommend you stick with your current girlfriend or at least break up with her if you are not really interested with her anymore and I do not condone ever for you to cheat.