I am still studying dentistry and it will be finish in about 2 years and I am in a relationship with my gf about 6 years. She is studying for genetics phd.

I believe that love has gone but I used to her. I cant give her up. And i known i am gonna marry with her even if i love her or not. We have some much common things about life. We like the same music, have the same opinion about government, religion etc. So i dont think that i will find a better wife then her.

Our relationship is so straight and peaceful. We barely argue but they usually finish without any problem. But we broke up last year in november. It was because of me. I thought that my love has gone for her and i flirted with some other girls to fill the blank. One of them is the girl i mentioned about in the description. We are studying together in the same class. Nothing happened special with my flirts other than talking.

After two month i came back to her and thanks to her she accepted. And then i decide that love is not the key thing in a healthy relationship. After the broke up our relationship becomes better then the last years. The only problem in our relationship is sex. We have never had sex but we are making love without problem. The reason is she wants to lose her virginity with mariage. I respect and accept that. We can make love 4 or 5 times in a year and this is a major problem for me. I am still trying to settle my sexual drive and i dont know how to handle this problem.

On the other hand we came so close with this flirty girl in theese days. We slept together friendly. And i think i am kinda friendzoned because of my long term relationship (of course she knows my relationship). But i can get out of friendzone if i really want. All i want from this girl is some flirt and sex. Nothing more. I dont want to cheat on my girlfriend for some sex i know it makes me like a shitty person but sadly i think i wont regret that. I need some advices about how can i get rid of this situation. Should i have sex with the girl i am flirting or convince my gf to have sex ( i dont think that she will accept )

English is not my mother tongue as you can see. Sorry for the mistakes that i made i hope you can understand what i tried to say and how i feel in this situation. And thanks for the comments.

TL;DR : i am in a long relationship with my gf for 6 years and we are good. But we never had sex. Thats the only but major problem. I am kinda flirting with a girl right now but i am friendzoned ( but if i try i can get out of friendzone) and i just expect some sex from this girl. What should i do ?