do i have to hate the person atleast a bit, i used to love, to forget him/her [I Like a Good Quote]

Hate brings very little. If you hate on them, you're actually hating on yourself for that period you spent with them. There might be actions you can hate, but that doesn't mean you have to hate all of that person. Things can go out of hand, and you can lose respect for someone, but again, that's not hate. It's a part of your past, like it or not.