But we're just friends?

A guy and I use to work together for about 3yrs in total. The first year we were just co workers. The 2nd year we started flirting or in his words "friendly bantering" so one day I confessed that I had feelings for him. He shut me down and said we were just friends and nothing more.

For the entire last year we were working together we were messing around. We did everything and we would often cuddle at work.. almost everyday given the chance.

We had one rule and the rule was that he would tell me if he ever got a girlfriend or started seeing someone. Well, I kept hearing rumors and I'd always ask him and he would always set the story straight. Well, the 5th time I heard a rumor I was done. I just up and quit and didn't give him the chance to settle the story. I was so mad that I was over it at that point. It had to do with another girl at work so I was done and at the time I didn't need a job anyways.

This all happened in May. Last week I reached out to him. I really do enjoy our friendship and I'd like to be on talking terms. We talked about what happened but he told me he's been upset with me ever since it happened.

I guess my question for you guys would be.. why is he upset? It's been 5 months and we were just friends.. I was over it a month later. I guess I just don't understand.

Side note: at one random point within the last year he did tell me he loved me in Japanese but it took me 3 days to figure what his text said and by that point it was awkward and feelings weren't mentioned again. I figured it was a fluke.

But we're just friends?
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