Yep, I know what you mean. I am few years older then you and in LTR for last 8 yrs. I had also huge problem with dealing with a fact that I am "doomed" to 1 exclusive girls and that I miss soooo many opportunities in life. Being around many beauties every day and knowing the fact that I can PU most of them made me crazy. But on the other hand, I don`t want to be PUA or to describe it better - guy who`s life mission is to sarge girls all life without setteling with one. No, I want a family, kids, house, gatherings, watching kids grow up, becoming succesfull people, son becoming PUA and chasing babes

etc., in other words, I want a normal life.
Does that exclude PUA lifestyle? In many situations it does. I will nevcer travel around world, teaching people on seminars, writing a book earn for money on it etc. I will never fuck every cutie that I can, I will never go out with mission to sarge. I will never live in some new "Project Hollywood" etc.
What I will do, and am doing is being nice to people, meet lots of new people every day, I will sarge girls but more indirectly (interacting with them without them even have a clue that I am trying to seduce them) but making them trying to pick ME up actaully. I will go out with friends and have a shit load of fun, knowing that that type of behaviour will make many cuties lay thei eyes on me. I will enjoy in fact that girls will ask me my phone number or add me as a friend on facebook after they meet me. My PU ego will be, or better to say IS very high and satisfied. I enjoy the fact that I am still ON, but my DECISION is to be faithfull to my baby. Did I ever cheat her in last 8 yrs? Yes I did and I was feeling like shit after that. Will I cheat again? Probably but not for every cause. I cheated when shit load of things happened at a same time, but I never cheated with attention to cheat, it was just a moment of blackout.
I do enjoy when gorgeous girls are attracted to me but in 99%, just achieving that makes me happy and I don`t have a need to go to the end. Actually, I do but I eject and go away from temptation. It also gives you a huge social value (being atractive but faithfull) so the circle keeps turning in your favour.
Anyway, although it may sound complicated it is actually not. I hope I helped you a bit.
Marco