I forgot you had the complicated situation, so just nix what I previously posted. You are correct in your assessment about being the one to say 'I Love You' first, at least that is the issue with me, but you are still in a somewhat good position, particularly since he loves you more (if this is true). So many variables and so many complications and so little time.
have even had more then one of them tell me that not only does she know she don't care and they have an understanding. I am a women, that just rings false to me.
I have known people whose wives and/or husbands have an understanding. This is not so much false as it isn't necessarily known amongst many couples.
Actually, I really have no advice to give, other than to give an opinion. I'm not a fan of soulmate/twin flame. What many readers fail to say too is that because it's a soulmate/twin flame, doesn't mean you are necessarily in a relationship with that SM or TF.
Bark Angel is very right though (in my opinion) and although it is more difficult/complicated in your situation, wouldn't you still rather know now instead of down the road? Wouldn't the hurt, hurt less if you know where things stand and not build up your hopes on nothing? This is just how I deal with things of this nature (just give it to me straight and with honesty, even the brutal kind) in how I feel about relationships. This is one of the reasons we seek out readers, because we just don't know.
We deserve better than just floating along and standing on the sidelines. We should be in the game, having picked our teams and enjoying ourselves. This is your life - write the story how you want it to turn out.
You can always broach the subject handfuls at a time, by saying something like....so where is this flingy thingy going? ...if you did decide to leave the wifey, how'd you do it and what would you say (just to feel it out). Just keep it light and playful (men love this, as anything emotional becomes too heavy), and they get scared real quick.
Also, remember that there is truth in jest. If you know him and understand him, perhaps it's his way of bringing up the subject of you two and feeling you out about the relationship. He has just as much at stake (his feelings, his pride, his heart, hurting others, etc.) as you do and if you haven't been hinting at anything long term, he would feel foolish if he were the only one to place all his cards on the table.