I pushed my girlfriend to find someone else
Why? Do you not find her attractive anymore?
Yes, she's still hot but I'm not attracted to her anymore.
I'm sorry she's no longer doing it for you.  That being said, I think it'd probably be better if you just broke up with her rather than manipulating her like that.  I think it'd go better for the both of you.
Yeah, maybe you are right. I want to dump her as soon as possible.
I wouldn't recommend you dump her as soon as possible. What I was suggesting is that you break up with her, but do it with her feelings and emotions in mind  and see to it that she will be okay after you guys have split up, that way there were no hard feelings and you can still stay friends.