Based on the additioanl info, I think you will both know if you want to move things onto a more permanent commitment, when that time comes.
The present Mrs Hughes (Keeps her on her toes!) and I were together for six years before we got married, and that ws nearly 22 years ago, and I have no regrets.
I have had one occasioan when I seriously thought I had met 'the one' - but I had made my commitment, and you simply have to be rational and adult about these things.
If you have no serious problems, just enjoy being together, and move on if you wish, and not if you don;t. Fortunately there is far less pressure to 'settle down' than there used to be - and if you get any, firmly ignore it, it's your lives, your choice.
Be happy!