Confession advice

A girl met me (yeah she met me, I was just minding my shit) when I was 16 when we both were going for a particular class. Later somehow both of us ended up joining the same college for class 11 and 12th(in bang we usually change from school to clg) We became friends. (When I think of it its her who befriended me, planned things)Around the last leg of 12th I had started liking her and kinda might have had a crush. we again joined same clg for BE. Though different streams. Since we lived almost 100-200 mts away. We used to travel together, attend, plan stuff and most of the time started to be spent with each other. Maybe just being with someone and if both aren't assholes we might like each other. By now I might have liked/loved her. I had to literally avoid and involve and ended heading the committees and used to meet a lot of folks. But never liked anyone else. Friends have started pairing me up with her and all though never shared or agreed with them. Now fast forward , we are done with engineering and she moves abroad for MS and I didn't pursue it immediately to pursue my interests. Now 6 years down the line, there isn't a single day that I haven't thought of her. I tried dating others. Everything feels good but I just couldn't move on from her and ended up ending things with people I tried dating who also are married now. Naturally after she moved and after edu and started working she would have tried dating others. Now the thing is she said she would get married this year or next year and I'm yet to move on. She was a great friend but I liked her, also the love of my life. Now I can't see anyone else in her place. How do I move on or should I confess it to her? (I feel confessing won't matter cuz, though all our friends could notice I liked her she never showed such interest I feel, also she naturally would know that I liked her (my girl isn't dumb). But never stopped being a friend too What do I do?