The question is...whether I should just keep moving on/letting go or go back to doing RS and loa stuff on him. I still love him no matter what and I always will, but for some reason I just feel like this whole thing was the universe forcing me to let go and focus on myself.

The fundamental difference between attracting a specific person and attracting a specific thing is that things don't change but people do. A sports car will always be a sports car but a person will grow and absorb and differ over time. You'll always have a space for this person in your life but this person will not always make you feel constantly good and secure in your thinking of them as a car would. A car can't ignore your calls but a car can't keep you warm in bed at night and say nice things to you. By wanting this specific person, you will be trying to see them in a way that suits how you want to feel about them but the problem is, they won't always be that way because people are flawed and people aren't here to be your ideal version of them all the time and people morph and change their preferences. You will always be in love with him in some way, but as time moves on, you will inevitably heal unless you make a definite decision not to heal. The ironic thing is , if you decide to be hung up on this person as the one or the best you'll ever have, the resistance really will grow and grow making it harder and harder for law of attraction to bring them or anyone else to you, but especially them. If you just quit them and make a decision to heal, you won't magically feel you don't want them anymore, but you will be training yourself to stop obsessing over them. It's not going to be easy, I still struggle, there's still been very few days where I haven't spared at least one thought to my specific person, but that's ok and that's normal but if you train yourself to just stop the thought for long enough, it will become easier. Then manifesting them into your existence tends to happen and more naturally but usually the total intensity you had for it will be gone and replaced by an intensity for something new. Sure, you'll be happy, but your world won't stop at that moment and in fact, you might even be looking at someone or something else. 

It's totally fine to be persistent with a desire just as long as you're consistent. I've had such a messy journey with maintaining focus and consistency. Sometimes I've hated him and felt disgusted by him, sometimes I just want him back soo much, sometimes I feel there's no love between us, sometimes I feel that the love is so strong between us. No wonder he isn't around yet ! Also I've personally been super obsessive, especially in the earlier part of the year, now not so much. When someone believes there's really unfinished business, then there usually is. The fact that you really believe that makes it true. There have been times where I've contacted people out of the blue only to find that it seemed that they had almost been waiting for that moment because they really believed there was unfinished business, even when I didn't, but I still made contact so their vibration of that 'unfinishedness' was strong enough to get a response from me. You won't forget about him, you never will, but you will become less and less emotionally involved in him over time if you keep no contact. That sounds crappy but it's good ! All that emotional anxiety and worry will go away and you'll just be left with clean, fond and attachment free feelings. When you get to that stage, you won't notice too much that he's gone out of town and you won't be worried about it, you'll just be pleasantly surprised that he contacted you but you won't be staring at your phone until he texts back. It will be as if you are starting again