Somebody please help me with this!

I really like my best friend... Were both girls and she has a boyfriend, but one day we went swimming then took a shower together and some things happened, but now she says she just wants to forget about it and that she was just horny. She's my best friend and I love her like a friend, but I really really really like her! What do I do? Please please please help me out! I need advice, and I have no one to talk to!