If you feel you need a confirmation from Tarot in order to investigate your relationship further, Then I will definitely say Yes.
As you say, You have known him for a long time, You know he has qualities you like, since he also like you, you need to have qualities he likes.
Any relationship build on mutual understanding, respect for each other, and feeling of equality, this can never be seen in any reading, only experienced through life.
I would recommend that you in a nice way try to find out if he see a future for you two, it will have great benefits for you, because if he agree, you both move your relationship forward, and if he disagree, and only want to keep you as friend, you get the confirmation you need to put your thoughts to rest, and start looking for your prince elsewhere
Often we go around with hopes that can't be fulfilled, we then prevent other options to come to us, and from my point of view, the years become shorter and shorter the older we become, so use your time good
Good luck either way
