The lingering feelings I am talking about aren't the attraction I feel to her, not at all. I know those will fade. The feelings I am talking about are my personal feelings of guilt that I have committed adultery in my heart. As you put it the feeling of guilt that I have for not being disgusted by her instead of infatuated. Those are the feelings that are haunting me and will continue to haunt me even if I don't see her again.
It is normal for us to have fleshly lustful thoughts. Just don't put them into action or fruition by committing adultery, rape/sexual harassment, fornication and other sexual immoralities. Sex should be within marriage.(either officially or unofficially.?)
....... Also, such lustful thought will not condemn us to hell as long as we believe that Jesus Christ died for us on the Cross.(ROMANS.5:12, LEV.17:11, HEBREWS.9:22) ...
MATTHEW.5: =
Murder Begins in the Heart
21 “You have heard that it was said to those of old, ‘You shall not murder, and whoever murders will be in danger of the judgment.’ 22 But I say to you that
whoever is angry with his brother without a cause shall be in danger of the judgment. And whoever says to his brother, ‘Raca!’ shall be in danger of the council. But whoever says, ‘You fool!’ shall be in danger of hell fire.
1JOHN.3: = 15
Whoever hates his brother is a murderer, and you know that no murderer has eternal life abiding in him.
_ _ _ _ _ _ _
Without faith in Christ, whoever has been angry or hated in his/her heart is condemned to hell when he/she dies. This means that before Christ(= 33 AD), everyone was bound for hell when they die. Today, everyone without Christ is bound for hell when they die.
....... But with faith in Christ, whoever has been angry or hated or lusted or jealous or greeded or feared or doubted in his/her heart is saved from hell when he/she dies.
Because the Pharisees of MATTHEW.5 chose to reject Christ, ...in order to be saved from hell, they would have to pluck out their eyes and chop off their limbs, turn the other cheek, walk the extra mile, lend to all who ask and love their enemies.
....... Those who accepted Jesus Christ would not have to do such silly things.
We should not put our sinful/evil thoughts into action by committing murder, adultery/sexual immoralities, stealing, lying/cheating, blasphemy, idolatry, etc. Those who willingly and/or continuingly or unrepentantly sin will likely not be saved.(JOB.2:9, 1COR.5:5, HEBREWS.10:26-31)
....... Those who repent from such sins/evil-deeds(eg King David - PSALM.51) and "Go and sin no more"(JOHN.5:14 & 8:11) will still likely be saved. Sometimes, Christians may sin unintentionally, ignorantly or foolishly or while under stress.(1JOHN.2:1)