Is there anyway to be hypnotized into forgetting someone or just "never meeting" someone..like and ex-gf

How possible is that? Can someone hypnotize me so I can belive I never met her in the first place or what. That would be really nice. I want to replace that whole years worth of memorys with anything else...like maybe I was a secret agent for all that time and I didnt actualy have some she devil sucking the life out of me. thanks