XMY, you never try you never know. 
That's what makes other option so interesting, you know in the end
you'll choose the (right) option. But the other options are not
wrong and worth a try.
Fun to boggle your mind for a while. 
____________________
I tot of this senario. Just for the fun of it.
You're married for 4 years and love your husband. When
you think everything is going strong, you've never been so happy
until you've meet him, now he belongs to you.
One day, you found out that he had a affair. He apologised
profusely and beg of your forgiveness. He wept and cried.....both
of you got seperated for 1 year; prepare for divorce procedure, you
never looked back because looking back means opening those deep
wounds even though he tried hard to win you back.
You've got into an accident and only knowing he is sleeping beside
you.
But you don't know who he is. You lost your memories, but you know
this guy who was by your side when you're in hospital is the only
person who cared.
He took care of you and showered you with every single thing you
need in life.
You got married to him(again) and you've never been so happy until
you've meet him, now he belongs to you....
He never looked back and loved you to the end....
:::: If You didn't lose your memory. It could have ended
different.
Two broken souls.
::: In that story. There is a chance of restoration and another
chance of re building innocence and pure sweetness in the
relationship.
No bitter memories to overcome, just LOVE....
_______________
Is it wrong? No.
Worth a try? To me, i dare not. But then again, why not?
Personally, i wouldn't choose to give the 'right' answer like - if
i forget, i'll never learn. This answers are good answers.
But for a personal opinion, i would ask - What would i lose in this
lost?
Would i lose the ability to love the girl i've been loving? Would
i
OR
What if my ex whom i love so much comes back and i forgot about
her???
Fear of lost.
:::nonetheless, it'll be another kind of experience if we have this
ability to erase our past.
p.s sorry ah. I'm not a good storyteller. Yunnie still does a
better job.

Cheers!