Hello, it is good that you came out to share your issue. That is one of the right thing in IMO. I am not sure if I understood your case clearly- however, from the information you shared, I think you are in a kind of confused state. Which is fine from my angle. You spent 5-long years together, that's great! Now you both know each other little bit. It's time to spice up your relationship and make it stronger and grow older. We all (at least majority!) go through this state of confusion- remember a German politician suggested to make marriage an agreement for 7-years only; if you like the marriage renew it, otherwise you both are free birds....

It's about right time (5 years) for the majority of married couples (who are still childless) their relationship is monotonous. Same person, same sex, possibly similar positions: in a way you know what to expect next..... How about taking some leadership role and exploring her more? Have you asked her if she is happy the way it is? Have you tried to change your everyday routine? Have you asked her to go out with you just for fun?  

In the meantime, couples who have kids by 5/6 years, they have some other reasons to continue the relationship- KIDS and that is family! From your post I sensed that you may not have kids yet. If you both want kids, have them...

If I were you, I would ask her: a. how she evaluates the relationship? b. if she wants to be the mom? c. if sex life is juicy enough? I am pretty sure she will bring a novel worth of issues. Then try to find solutions with her for each of the issues. Remember, she is just like you and the mantra is "Compromise". 

Whether you "arranged" or "loved" your marriage, if you have been husband and wife for 5 years, you both love each other.

Therefore, try to understand each other and spice up the relationship! You can do it and it is the right thing to do! Good luck!!!