Re: She was the one, i love a lot, but not anymore…
No idea what this means, sorry. I would hazard a guess, but at the risk of sounding like an idiot, I won’t. 
Back to the actual topic, I don’t think you really want to marry this girl, and the only reason why you are considering her is because she was once a potential who you couldn’t have.
Btw, how would you feel if she was to marry someone else now? If there are no feelings as to this, then you’re good to go.