KJ - No, I don't know you and you don't know me. I don't know the memories you have and the bad stuff you refer to.
And you don't know the memories I have and the bad stuff I deal with.
What I do know is that our God is able. Able to do exceedingly above all that we ask or are able to do ourselves. I can't tell you if you pray to Him in sincerity over wanting to forget painful things whether He will answer with a "yes" or a "no". That is His call, obviously.
But I don't believe we possess the ability to forget. We are not God, although we are His children, and there are many attributes of His that we do not hold in possession at this time. Our physical bodies, in my opinion, function with certain limitations, and our minds' inability to forget is one of them. Can we put the memories behind us as Paul said? Yes! Will they ever be totally gone? I don't think so. We can cover them up, we can hide them away, but they don't ever totally disappear.
I believe that is one of the ways that forgiveness becomes such a blessing to us. Because while we still have the memories, we can choose to put them under God's sovereign control, forgive, and turn our focus on the present and the future. We have to make a concerted effort to let those things, or the reaction we have to them, not control us anymore.
Go back and get bit by the "snake"? To me, that sounds like a dumb idea. But forgive the "snake" and leave the pain of the bite in the past so it does not control me now and in the future? Definitely!
If the snake truly repents, and that would have to be PROVEN, I would still hold it at arms' length. With a tight noose. Depending on the relationship, it might take a long time before I would ever be comfortable in its' presence.
I believe the severity of the wrong and the value of the relationship really play a role in all of this. Long post - Sorry!