How do I resolve this awkward situation?

I really lime this girl (she has a boyfriend) and I am pretty sure she like me back. Anyways we r doing les mis at school together. I was Marius the other guy was sick (long story) and she is eponine. When she dies she kisses him and then dies but they had agreed not to do it. When we were doing it I went to turn away she grabs me and kisses me for a pretty long time and then died. I carried off stage and she just walked away didnt say a word. I have not spoken to her since. Saw her today and we were staring a each other. It was a bit awkward. How can I resolve this issue of awkwardness