When can you lead a happy life?!!
If and only if both of you are interested in living together as couples.
When you both knew, that you cannot get married, on what is the probability, do you want to wait.
Because, you wanted it, and you are seeking it, that alone is not a sufficient enough for you to wait for her.
The more you wait, the more you are in Irritation mode.
Do you want to lead your rest of your life like this?!!!
Next Steps
For more clarity do consult a psychologist.
You can even Consult with me online in this portal.