I don't get to meet many people with reactive arthritis on a PMR/GCA forum. There are other triggers for Reactive arthritis and chlamydia infections waere once thought to be the primary cause of reactive arthritis. Almost any sexually transmitted disease (STD) can cause it. Now the belief is almost any infection can trigger reactive arthritis. The following link explains it reasonably well.
https://pmc.ncbi.nlm.nih.gov/articles/PMC4952977/
"Most cases are self-limiting and resolve within 4–6 months but 50% have recurrent episodes and up to 17% have chronic symptoms. Advise patients about safer sexual practices and good food hygiene to avoid potentially 'triggering infections' in the future."

I'm certain my reactive arthritis was not triggered by a STD. It happened after a visit to Romania in the early 1990's. The food sanitation wasn't very good in those orphanages in Romania back then.

The above quote is true. At first reactive arthritis did resolve for about 5 years ... then it started recurring ... and then it was chronic. Reactive arthritis doesn't prevent someone from having PMR when they are old enough to have PMR.

Were you ever tested for HLA-B27? There are many syndromes related to being HLA-B27 positive.
https://emedicine.medscape.com/article/1201027-overview