Do you think it's bad that I'm still in love with my ex-grilfriend?
Yes, if you're dating someone else. Is your ex-girlfriend still in love with you?
No she told me I need to get over her and move on. But I can't, I'm still in love with her.
You should not force your self on someone when they have rejected you. It is ok to feel sad when you get disappointed.
I'll make her see how much she means to me and she'll come back to me.
It's not healthy to obsess over your ex-girlfriend. She's made it clear your relationship is over and you need to move on, you'll never have a romantic relationship with her. I think you should see a therapist to work out your issues if you can't accept the situation.