Single AP Trying to Figure This Out

Met my AP almost 2 years ago. Developed a friendship over 6 months then FWB which failed & turned into feelings pretty quickly, for him a little faster. Situation is bit unique in that he works in my area & travels home only a few days a month (2k miles away) if that. We’re with each other every day but it’s mostly on my terms, as I try to keep some emotional distance (that’s not working very well either). He had a timeline in place several years before us meeting. As his original timeline is approaching, he doesn’t know if he can build up the strength to ask for a divorce.