urgent*Problems Understanding my Love and Relationships,

I am Having Problems Understanding my Love and Relationships,
I m seeing a girl for last four years ,for family reasons we cant marry and we accepted it.
hence my family stared seeing girl for me and I feel somewhere I am am ready for arranged marriage .
BUT problem is :-
Me and my girlfriend in same city so we meet , talk and chat and she is still one to talk (as i dont have many friends in this city, it wasnt required actually to make new friends )I dont say i am dependent to her for everything , but i really enjoy being with her or may be I am addicted to her ...I dont know ...
She knows that chances are very less for our marriage , she loves me so much and still waiting for some miracle.
We discussed so many times that we should not meet or talk , but cudnt do so .
When I am busy I really dont think about her much , but when she is busy with her friends or cant come to see me I feel so hyper ,frustrated, and disappointed.

I am really CONFUSED pls advise me ..do I love her truly ? or just i need some comapny ? should I marry her ?

If you lived in Sweden, like I do, you would marry the girl you have seen for four years. Arranged marriages does not exist here. But you live in a culture I am not familiar with. Ask a wise person in your own culture what would be the right thing to do.