I met this girl few days ago, I started with a mystery opening and after 20 minutes we moved in another place to take a coffee. After a while we were starting to making over, when SURPRISE! she told me that she has a boyfriend (she didn't tell me before), this is the reason 'casue we had to stop. I tried to say something like:"Hey, nothing happend, maybe you felt the need to do a new experience with someone else", but never changed. We talked about music and hobbies for a while, than she gave me her number and email address and she leave.

Where's the error? how to broke the "boyfriend shield" in her mind?

thanks!!!

p.s. I'm sorry for my english, i'm trying to improve it )