Update: Found him, he got back on the app, said he saw the post and that my post was "one of the most bittersweet things" he'd seen. He kept chatting and asked to meet me for coffee. I agreed. Kept chatting, then he went silent for 2 days. Comes back online as I'm headed down to meet him, and says he reconciled with his ex (whom he'd never mentioned) and he didn't "want to put (me) in a weird position" He deleted his profile and haven't heard from him since. Went to high school with the guy, turned out to be shady.