You can go to her marriage, beat up the boy. Beat up his entire family, then beat up your girl's father. She will stop you from beating up her father, then you must stop. You say in front of everyone that you love her. Her father will say some poor street trash like you can never marry his daughter.
Then the girl will say in front of everyone she loves you too. Everybody is surprised. You use one of your wounds to put blood on her forehead, and grab her to walk out. While walking out, you get hit in the head with a hockey stick. The boy she was going to marry grabs your gf and reveals to everyone that he needs this girl, so that he can have her family's wealth.
This is where you get up and beat up 20 of his family members/goons. Then you have a one on one fight and beat him really bad.
Then you grab your crying girlfriend and stare down her father. Her mother says jao beta.
As you walk away with your gf in your arms, her father shouts your name, and tells you that even though you are a loser he respects you and accepts you as his son-in-law.
Then you and your gf break into song and dance, and get married.
Well it's your choice.