So, I’d like to report that after months of head banging on the same wall about a situation at work. I’ve finally just decided to stop the nonsense 
. I noticed that each time I was getting upset there was a point where I choose to go down this path, backed up by whatever morals or beliefs.
I finally decided to stop when the situation came to a point where it was clear that I had the choice to remain feeling bad or punish the person for having ‘wronged me’, or see the situation as it is and see there is no reason, no point, no advantage to choose to feel bad about this. I gave myself a time limit to choose whichever path to go to as I had to spend a full day travelling to London and attending events with this person the next day. I was given the option not to go but I decided to put my money where my mouth is, choose to go and choose to let go of this feeling bad that I was so bent on keeping alive. Im glad to say it was easier than I thought and less of a choice, rather a “this makes more sense”, I guess with enough running into the same dead end I actually became sick of feeling this way. 
We ended up having a lovely day in London and we are back at work with nicer vibes in the office. From the outside it looks like i’ve ‘forgiven’ but it’s more like I would much rather spend my time being happy and harmless as much as I can whilst I’m alive rather than waste it feeling bad or making someone else feel bad. Just being reminded that we are all living life for the first/only time and what a waste it is to remain feeling bad. It kind of put into perspective that feeling bad does nothing ‘good’ at all.
Hopefully it won’t take months next time