Have I made a mistake?

So..i'm talking to an old friend who I had a lot of problems with. However, she was also my best friend and most times it was great. She did really fuck me about though, and my parents don't like her. But lately, I've been missing her. And we're talking and we're having a heart to heart. I really, really don't wanna get down again. Because I feel so healthy and more myself than ever. Is there such a thing as being friendly with her and feeling like myself? Also, I don't wanna let my parents down. They really, really don't like her. But I just cannot be bothered with looking the other way every time I see her and acting like we hate each other. Because we don't. Lifes too short to be hating. i just hope this time round, its a happy ending...