بِسْمِ اللهِ الرَّحْمنِ الرَّحِيمِ
 السلام عليكم

Forgiveness is giving up the hope that that past could have been any different.

"When we cannot move on from the past....when we keep reliving an event or a period of time, or a situation....it's because inside of us...there still exists a small amount of hope. We believe, maybe unconsciously, that by keeping that hope...and reliving the past over and over, that we still have the ability to change what has happened. Which is impossible. So to forgive...is to let go of that last bit of hope.....to finally realize we cannot change the past and it ultimately has no control over us anymore." by hellowmark (qtd Oprah)

 Forgiving does not mean forgetting and it does not mean you'd accept the person back (in this case, trust is something that you earn not receive in a fort night). Forgiving is about giving up that tiny hope and setting yourself free..now if you love yourself ateeqa nasha, be fair to yourself. Stop feeling sorry for yourself and JUST FORGIVE!

"Forgive me as how you want Allah to forgive you." 

...said an unfaithful husband to his wife and believe it of not, that quote had saved their marriage that was on the verge of divorce. subhanallah.