PLEASE help.. My two lovers wants me... But i'm in love with one girl only

Hello guys.. I'm from India..
I was in relation with my college classmate for an year..
At first she had a crush in me, We became good friends first, and later she proposed me.. I accepted it because of sympathy on her.. I didnt actually have a feeling of love on her.
Later we started hanging out in parks, kissing, hugging, licking, etc. . . in fact we did everything except having sex..
Later after an year i felt like its better to tell her that i didnt actually love her and i did all those activities because of excitement at that moment..

Later i met a new girl who entered my college as my junior.. I had a feeling of love on her at the first sight itself.. My heart was telling "i want her, i want her"
i started speaking with her, i helped her in her studies.. i took care of her while seniors were ragging juniors.. Since then i coudnt enter the class without meeting her and speaking with her..
Seeing my care on her, she fell in love with me, she proposed me and i accepted her..
Now, my classmate who i was in relation before wants me madly, she is crazy about me.. She says that she wont allow anyone else than me to marry her, and she wont allow anyone to touch her.. She says she will stay unmarried until i marry her..

But i'm in love with the other girl, And i want to marry her only.. I cant leave her.. When i tell that to this girl, she says "then why did u spoil my life? Now i wont allow anyone else than u to marry me or touch me.."

WHAT SHOULD I DO?? PLEASE give me a solution..

NO sympathy for you. You led this poor girl on to get your dick wet. Your an asshole, and I hope the woman you supposedly love breaks your shallow heart like you broke the other girl's. Seriously, you're fkn sick.