I accept his past, yes, but I don't want to be a part of it

I'm not sure if I'm okay with knowing things too much about his past. Last night, he took me to the gym facility where he started. Initially I welcomed the idea. I was glad he was willing to introduce me to his past. What I didn't realize is that I was also about to meet his past past. He reunited with his circle of friends, the same friends he had when he was dating his ex-girlfriend, the same friends I suppose they share. 

Of course I was proud to see how excited he was, and so were they when they saw him approach the establishment. Although I didn't know which side of me I should manifest. I expected a humble beginning, just like everyone else, but then he brought up the "coming back" part if "he resigns Anytime Fitness" so I was automatically shook. I think he was flattered he was greatly entertained that he imagined a familiar environment for the weeks to come. They encouraged him to compete again and right then and there all I could think of is a different set of faces. This wasn't just about seeing his past, this is about incorporating me to his past. This is about catching up to his past. And I'm not sure I like his past. I accept his past, yes. But I don't want to be a part of it. He dated his friend's sister for several years for goodness sake. Moreover, this friend whose sister he dated owns the freaking same gym where he started. 

I can't fathom how ignorant he was about crossing paths with his ex-girlfriend. It's beyond possible to see her these coming days. It's all in this one community after all. And I'm not sure I like that idea. I'm not sure I like him leaving Anytime Fitness. Because if I was introducing him as a gym instructor, he might as well be an Anytime Fitness gym instructor.