How to remove hate for someone.

LI am the kind of guy ke jo kisi ke liye dil main koi hate nhi rkhta and i forgive really easily, it more like for my own peace i forgive easily but obviously do get cautions none the less remove any malice or hate for them.

But something happened 1 year ago , and that person did something to someone really close to me , shyd mere sath kia hota to maine maaf kr dia hota , but i haven't been able to forgive that person , each time i try the hatred comes back stronger. And not like a normal hate but more like i wont be able to tolerate his presence infront of me and would end up removing an filter from the interaction due to which i totally avoid that person , ensuring no direct contact.

And the thing is that person asked for forgiveness a single time , that too in a very debatable way , on a mssg but emotional texts , and now he acts like it was all our fault and he was in the right and acts as a victim whenever that thing comes up.

Now the main issue is , i want to remove this keena from my heart , since in islam its disliked and am starting to feel its effect on my prayers and imaan. I just want to forget about all that , the person to which it happened has maybe forgiven him but he(the close person) doesn't know many things that were done by the person i hate.

How do i sincerely remove this overwhelming and ever increasing hate from inside myself , obviously i am gonna still be cautious of him but atleast i wojt be hating his entire existence, everytime i try to forgive i remember the things he did and how many struggles and problems my close person had to face.

I really want to let got of it, but haven't been able to.