I haven't spoken to my ex best friend for 4 years now. I still have moments were I think about her but I can hand on heart say my life's a better place without her in it. That doesn't mean I don't sometimes reminisce and feel sad it turned out this way. But that feeling is getting less and less as each year goes by. I'm a big believer in life being too short to have crappy people in your life. My life is too short to have someone who gave me the most horrendous anxiety amongst other things. Just keep it as it is but realise that things often happen for a reason.