Guys Help me about my crush

Hey Guys...
I was really fall in love with my crush.But sadly she already has a boyfriend but I got her answer that she like me when we are travel together.I mean group travel from university. We sat together on the bus we walked together. We played together at the beach and enjoyed the sun set together everyone in our group thought we are lovers. Seriously, over 60 people thought we are lovers. And I told that I love her so much and sang for her in front of all people. We have a pretty nice feeling until the travel end. But when we get back to our university she doesn't talk to me. She just talk to me sometime that she need my help. I really like her, I want her to be with me. I thought she love me but it's just a little. Can u guys tell me what should I do to get her or choose me over her boyfriend. As I know her boyfriend is suck. Her parents doesn't allow to be with him forever. Now her boyfriend is living about 300 miles away from her. I mean they are long distance relationship. As for me we see each other everyday. That's all guys. Please help me. What should I do?