The key lies in forgiveness, not ignoring or pretending to not notice or care. You love her or you would not feel such intensity. Forgiveness may come in stages. I seperated and divorced 2/3 yrs ago. I have absolutely no knowlegde of another man but I have dreamed of facing him I have dreamed of choking her to death. This is only because I love her otherwise I would not care so deeply otherwise I would have someone else the next week. My key to forgiveness was realizing that even though I "Felt" that I was wronged and innocent of transgression. That this was the culmination of me not being the best "ME" that I could be. Even though most see me in a high light My soul knew I was better than what I chose to reveal. My soul knew I needed to be shook upside down by my toenails and that is what I did.
Anyway setting the intent that to forgive was best and clearly understanding the implications was next.. Next even when those thoughts arise I worked on not communicating them, next I worked on stifling them as they arose in thought... these are temporary measures but over time I restructured myself in all areas so that I lose all lower fears once you lose those inner fears you can release them as they are useless you transcend those petty issues and can release even that which you love. You feel no need to control or attach.