Hi M. :)
The only thing to be concerned about is yourself. I don't mean that in a selfish or nasty way either. These two still have unfinished business from the sound of things. And as for him, he does not sound ready to get close in a relationship yet because it will suffocate his healing... his being with anybody- including you- is nothing more than a distraction (rebound) from what he needs to be focusing on right now, and that is the lesson that life has presented to him from their relationship not working out. If he chooses to learn from it and move forward and grow as a person, mentally and spiritually, letting his inner self expand and understand more of who he is, then hats off to him! If he is going to deny his pain and be complacent being stuck in yesterday, then you, too, my darling, will be stuck in your life as you are now with him. You are riding on his emotional merry-go-round.
What you have written in your posting is a great to yourself :) You have answered your own questions. There are times, like when our hearts want so desperately to find, give, and receive love, that it is difficult to realize our own answers coming from within, but that is where they always are :) and from where will always come. You can get advice from a 100 women here; they may sway you in one direction and another. Some may trigger emotions- old and new- in what you will read. Others will write from experience and others will just tell you to tell him to get lost. Every women who writes and many who read will be supporting you in their hearts. :) Given that fact, you can feel reassured that all of that love energy is attached to you your higher self and will be there to help you get through any decision you make. :)
If you can, for a moment, put everything out of your head. Think about what advive you truly have asked for here... these are BIG questions/issues because the longer you are with this guy, the more you lose part of your "self" to him. There are people and situations in our lives that have the potential to take part of our souls as well. People's deepest pain and most necessary healing comes from experiences where this has occured, but they- maybe even most people- may not even realize that this is what has happened to them. In what you wrote, he doesn't sound strong right now. He doesn't sound over her. By that I mean that he hasn't let go of things, he hasn't started a healing process, perhaps a forgiveness process... maybe there are things he doesn't yet understand? He seems as if time will continue with him stagnant in this space. My advice, and gut feeling, would be NOT to accompany him. You keep your own power! You seem now as if you are at the doorstep of possibly surrendering it despite all of your hesitations, and like you are looking for a reason to just say "hell with" and just go for it, when I think, deep inside, you know it doesn't feel right. You only want it to just feel right... Ultimately, most people want to be loved and have that special someone. There's nothing wrong with that. But when one disregards their own well-being and happiness, and allows their precious spirit to be disrespected or abused, THEN there's (a) HUGE problem(s)!!!!! And one will have them... many of them!
So M., I hope whatever choice you make is completely honest within yourself. Honesty hurts sometimes, but never as badly as denying it will hurt in the end. :) Please do yourself a favor and re-examine this relationship and what you wrote in your posting. There will be someone who will come along and knock your socks off! This guy now doesn't even sound close to emotionally being ready to sweep you off your feet yet. I'm sorry if that hurts you. However, before you have invested way too much of yourself- because you seem the type to fully embrace and give 110% to the one you love- I want you to remember that love isn't supposed to hurt. Love isn't supposed to question. Love doesn't stay stuck and go back and forth between two people at the same time. Love releases happy, popping joy bubbles from our hearts. :D Love speaks, feels and knows without saying a word. Love shows respect and honor. It allows growth, not by holding one back out of fear, but by loving them unconditionally and letting them fly! Love does so many wonderful things... love makes us smile :) ... one cell at a time!
All my best to you. My highest, most positive thoughts are there to give you strength and support you also! :) Please let me know how you are doing and what you decide. :)
In Light,
J.